Paperclip skip no img file

profile.rb

  has_attached_file :face,
    :default_style => :s120,
    :styles => {
      :normal => "180x180#",
      :s120 => "120x120#",
      :s48 => "48x48#",
      :s32 => "32x32#",
      :s16 => "16x16#"
      },
    :url => Askjane::MetaCache.get_config_data("profile_face_url"),
    :path => Askjane::MetaCache.get_config_data("profile_face_path")
    
  validates_attachment_content_type :face, :content_type => ['image/jpg', 'image/jpeg', 'image/pjpeg', 'image/gif', 'image/png', 'image/x-png']

  validates :face, :presence => true
  validates_attachment_size :face, :less_than => 2.megabytes, 
                          :unless => Proc.new {|m| m[:face].nil?}

  before_post_process :image?
  def image?
    #breakpoint
    !((self.face.content_type =~ /^image\/*/).nil?)
  end