Fixed bug when Picasa photos had comments.

Note that I broke a spec concerning how class_from_xml responds to invalid
feed types, though I'm not sure why it worked in the first place. If there are
any rspec gurus reading, I'd appreciate some input.

lib/ruby_picasa.rb

@@ -351,19 +351,16 @@ def class_from_xml(xml)
           RubyPicasa::User.new(xml, self)
         when /#photo$/
           RubyPicasa::RecentPhotos.new(xml, self)
-        when nil
+        else
           RubyPicasa::Search.new(xml, self)
         end
       when /#album$/
-        case entry_scheme
-        when nil, /#photo$/
-          RubyPicasa::Album.new(xml, self)
-        end
+        RubyPicasa::Album.new(xml, self)
       when /#photo$/
         case entry_scheme
         when /#photo$/
           RubyPicasa::Search.new(xml, self)
-        when nil
+        else
           if feed_href && (feed_href.starts_with? 'http://picasaweb.google.com/data/feed/api/all')
               RubyPicasa::Search.new(xml, self)
           else

spec/ruby_picasa_spec.rb

@@ -332,7 +332,10 @@ def to_create(klass, feed, entry)
       it('photo nil')   { to_create RubyPicasa::Photo, @photo, nil }
       it('photo photo') { to_create RubyPicasa::Search, @photo, @photo }
     end
-
+
+    # I broke this test, though I'm not sure how to fix it (or why it ever 
+    # worked to begin with).  Shouldn't it always break when you pass in a 
+    # symbol instead of actual xml?  -- kueda 2009-12-29
     it 'should raise an error for invalid feed category types' do
       @p.expects(:xml_data).with(:xml).returns([:xml, @album, @user])
       lambda do