Ignore NotFound exceptions from CarrierWave when destroying models with dangling references to missing files.

user.rb

class User < ActiveRecord::Base
  mount_uploader :avatar, AvatarUploader
  
  # Override to silently ignore trying to remove missing
  # previous avatar when destroying a User.
  def remove_avatar!
    begin
      super
    rescue Fog::Storage::Rackspace::NotFound
    end
  end

  # Override to silently ignore trying to remove missing
  # previous avatar when saving a new one.
  def remove_previously_stored_avatar
    begin
      super
    rescue Fog::Storage::Rackspace::NotFound
      @previous_model_for_avatar = nil
    end
  end
end