All objects should return themselves on unserialize()

svn: r19672

src/gen/lib/mediabase.py

@@ -63,6 +63,7 @@ class MediaBase(object):
         Convert a serialized tuple of data to an object.
         """
         self.media_list = [MediaRef().unserialize(item) for item in data]
+        return self
 
     def add_media_reference(self, media_ref):
         """

src/gen/lib/mediaobj.py

@@ -133,6 +133,7 @@ class MediaObject(CitationBase, NoteBase, DateBase, AttributeBase,
         NoteBase.unserialize(self, note_list)
         DateBase.unserialize(self, date)
         TagBase.unserialize(self, tag_list)
+        return self
 
     def get_text_data_list(self):
         """

src/gen/lib/tagbase.py

@@ -59,6 +59,7 @@ class TagBase(object):
         Convert a serialized tuple of data to an object.
         """
         self.tag_list = data
+        return self
 
     def add_tag(self, tag):
         """