Don't try to get the file name of purged files

lib/galaxy/managers/datasets.py

@@ -186,19 +186,21 @@ def serialize_file_name( self, dataset, key, user=None, **context ):
         of the file that contains this dataset's data.
         """
         is_admin = self.user_manager.is_admin( user )
-        # expensive: allow conifg option due to cost of operation
+        # expensive: allow config option due to cost of operation
         if is_admin or self.app.config.expose_dataset_path:
-            return dataset.file_name
+            if not dataset.purged:
+                return dataset.file_name
         self.skip()
 
     def serialize_extra_files_path( self, dataset, key, user=None, **context ):
         """
         If the config allows or the user is admin, return the file path.
         """
         is_admin = self.user_manager.is_admin( user )
-        # expensive: allow conifg option due to cost of operation
+        # expensive: allow config option due to cost of operation
         if is_admin or self.app.config.expose_dataset_path:
-            return dataset.extra_files_path
+            if not dataset.purged:
+                return dataset.extra_files_path
         self.skip()
 
     def serialize_permissions( self, dataset, key, user=None, **context ):

templates/show_params.mako

@@ -188,7 +188,9 @@
         <tr><td>UUID:</td><td>${hda.dataset.uuid}</td></tr>
         %endif
         %if trans.user_is_admin() or trans.app.config.expose_dataset_path:
-            <tr><td>Full Path:</td><td>${hda.file_name | h}</td></tr>
+            %if not hda.purged:
+                <tr><td>Full Path:</td><td>${hda.file_name | h}</td></tr>
+            %endif
         %endif
     </tbody>
 </table>