Changed ENOENT to NotIdentifiedByImageMagick, which should work with whiny_thumbnails

lib/paperclip.rb

@@ -65,6 +65,9 @@ module Paperclip
   class PaperclipError < StandardError #:nodoc:
   end
 
+  class NotIdentifiedByImageMagickError < PaperclipError #:nodoc:
+  end
+
   module ClassMethods
     # +has_attached_file+ gives the class it is called on an attribute that maps to a file. This
     # is typically a file stored somewhere on the filesystem and has been uploaded by a user. 

lib/paperclip/attachment.rb

@@ -189,10 +189,8 @@ module Paperclip
                                                    dimensions,
                                                    format, 
                                                    @whiny_thumnails)
-        rescue Errno::ENOENT  => e
-          @errors << "could not be processed because the file does not exist."
         rescue PaperclipError => e
-          @errors << e.message
+          @errors << e.message if @whiny_thumbnails
         end
       end
     end

lib/paperclip/geometry.rb

@@ -18,7 +18,7 @@ module Paperclip
     def self.from_file file
       file = file.path if file.respond_to? "path"
       parse(`#{Paperclip.path_for_command('identify')} "#{file}"`) ||
-        raise(Errno::ENOENT, file)
+        raise NotIdentifiedByImageMagickError, "#{file} is not recognized by the 'identify' command."
     end
 
     # Parses a "WxH" formatted string, where W is the width and H is the height.