Fixes for Implicit Datatype conversion and external display applications.

lib/galaxy/datatypes/display_applications/parameters.py

@@ -92,6 +92,8 @@ class DisplayApplicationDataParameter( DisplayApplicationParameter ):
             #find target ext
             target_ext, converted_dataset = data.find_conversion_destination( self.formats, converter_safe = True )
             if target_ext and not converted_dataset:
+                if isinstance( data, DisplayDataValueWrapper ):
+                    data = data.value
                 assoc = trans.app.model.ImplicitlyConvertedDatasetAssociation( parent = data, file_type = target_ext, metadata_safe = False )
                 new_data = data.datatype.convert_dataset( trans, data, target_ext, return_output = True, visible = False ).values()[0]
                 new_data.hid = data.hid

lib/galaxy/model/__init__.py

@@ -1353,7 +1353,7 @@ class ImplicitlyConvertedDatasetAssociation( object ):
         elif isinstance(parent, LibraryDatasetDatasetAssociation):
             self.parent_ldda = parent
         else:
-            raise AttributeError
+            raise AttributeError, 'Unknown dataset type provided for parent: %s' % type( parent )
         self.type = file_type
         self.deleted = deleted
         self.purged = purged