legato filtering out 0-result dates?

analytics_test.rb

# Inspired by https://gist.github.com/3166610
require 'google/api_client'
require 'date'

API_VERSION = 'v3'
CACHED_API_FILE = "analytics-#{API_VERSION}.cache"

# Update these to match your own apps credentials
service_account_email = 'foobar@developer.gserviceaccount.com' # Email of service account
key_file = '/tmp/foobar-privatekey.p12' # File containing your private key
key_secret = 'foobar' # Password to unlock private key
profileID = '123456789' # Analytics profile ID.

client = Google::APIClient.new(
  :application_name => 'foobar',
  :application_version => '1.0.0')

# Load our credentials for the service account
key = Google::APIClient::KeyUtils.load_from_pkcs12(key_file, key_secret)
client.authorization = Signet::OAuth2::Client.new(
  :token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
  :audience => 'https://accounts.google.com/o/oauth2/token',
  :scope => 'https://www.googleapis.com/auth/analytics.readonly',
  :issuer => service_account_email,
  :signing_key => key)

# Request a token for our service account
client.authorization.fetch_access_token!

analytics = client.discovered_api('analytics', API_VERSION)

startDate = DateTime.now.prev_month.strftime("%Y-%m-%d")
endDate = DateTime.now.strftime("%Y-%m-%d")

puts "Grabbing stats from #{startDate} to #{endDate}"

visitCount = client.execute(:api_method => analytics.data.ga.get, :parameters => {
  'ids' => "ga:" + profileID,
  'start-date' => startDate,
  'end-date' => endDate,
  'dimensions' => "ga:month,ga:day",
  'metrics' => "ga:pageviews",
  'filters' => 'ga:pagePath=~/files/9880vr69g',
  'sort' => "ga:month,ga:day"
})

print visitCount.data.column_headers.map { |c|
  c.name
}.join("\t\t")
puts
visitCount.data.rows.each do |r|
  print r.join("\t\t"), "\n"
end

# > ruby analytics_test.rb
Grabbing stats from 2014-03-03 to 2014-04-03
ga:month                ga:day          ga:pageviews
03              03              3
03              04              1
03              05              3
03              06              2
03              07              6
03              08              1
03              09              0
03              10              1
03              11              0
03              12              1
03              13              1
03              14              0
03              15              0
03              16              2
03              17              1
03              18              5
03              19              3
03              20              1
03              21              0
03              22              2
03              23              2
03              24              2
03              25              0
03              26              1
03              27              1
03              28              2
03              29              0
03              30              0
03              31              1
04              01              1
04              02              0
04              03              2

legato_test.rb

# Needed for generating token
require 'google/api_client'
require 'oauth2'
# Needed for model
require 'legato'

def service_account_user(scope="https://www.googleapis.com/auth/analytics.readonly")
   client = Google::APIClient.new(
     :application_name => "foobar",
     :application_version => "1.0.0"
   )
   key = Google::APIClient::PKCS12.load_key('/tmp/foobar-privatekey.p12','foobar')
   service_account = Google::APIClient::JWTAsserter.new('foobar@developer.gserviceaccount.com', scope, key)
   client.authorization = service_account.authorize
   oauth_client = OAuth2::Client.new("", "", {
      :authorize_url => 'https://accounts.google.com/o/oauth2/auth',
      :token_url => 'https://accounts.google.com/o/oauth2/token'
   })
   token = OAuth2::AccessToken.new(oauth_client, client.authorization.access_token)
   Legato::User.new(token)
end

class Pageview
  extend Legato::Model

  metrics :pageviews
  dimensions :pagePath, :date
  filter :for_path, &lambda { |path| contains(:pagePath, path) }
end

start = DateTime.now.prev_month
today = DateTime.now
path = '/files/9880vr69g'

user = service_account_user
profile = user.profiles.detect { |p| p.web_property_id == 'UA-foo-bar' }

puts profile.pageview(start_date: start, end_date: today, sort: 'date').for_path(path).collection

# > ruby legato_test.rb
#<OpenStruct pagePath="/files/9880vr69g", date="20140303", pageviews="3">
#<OpenStruct pagePath="/files/9880vr69g", date="20140304", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140305", pageviews="3">
#<OpenStruct pagePath="/files/9880vr69g", date="20140306", pageviews="2">
#<OpenStruct pagePath="/files/9880vr69g", date="20140307", pageviews="6">
#<OpenStruct pagePath="/files/9880vr69g", date="20140308", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140310", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140312", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140313", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140316", pageviews="2">
#<OpenStruct pagePath="/files/9880vr69g", date="20140317", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140318", pageviews="5">
#<OpenStruct pagePath="/files/9880vr69g", date="20140319", pageviews="3">
#<OpenStruct pagePath="/files/9880vr69g", date="20140320", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140322", pageviews="2">
#<OpenStruct pagePath="/files/9880vr69g", date="20140323", pageviews="2">
#<OpenStruct pagePath="/files/9880vr69g", date="20140324", pageviews="2">
#<OpenStruct pagePath="/files/9880vr69g", date="20140326", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140327", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140328", pageviews="2">
#<OpenStruct pagePath="/files/9880vr69g", date="20140331", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140401", pageviews="1">
#<OpenStruct pagePath="/files/9880vr69g", date="20140403", pageviews="1">