wrap get_entry_and_processing_manager in try, except block

mediagoblin/gmg_commands/reprocess.py

@@ -254,6 +254,9 @@ def available(args):
         media_type = args.id_or_type
         media_entry = None
         manager = get_processing_manager_for_type(media_type)
+    except ProcessingManagerDoesNotExist:
+        entry = MediaEntry.query.filter_by(id=args.id_or_type).first()
+        print 'No such processing manager for {0}'.format(entry.media_type)
 
     if args.state:
         processors = manager.list_all_processors_by_state(args.state)
@@ -284,6 +287,7 @@ def available(args):
 
 
 def run(args):
+    try:
         media_entry, manager = get_entry_and_processing_manager(args.media_id)
 
         # TODO: (maybe?) This could probably be handled entirely by the
@@ -308,6 +312,10 @@ def run(args):
             reprocess_action=args.reprocess_command,
             reprocess_info=reprocess_request)
 
+    except ProcessingManagerDoesNotExist:
+        entry = MediaEntry.query.filter_by(id=args.media_id).first()
+        print 'No such processing manager for {0}'.format(entry.media_type)
+
 
 def bulk_run(args):
     pass