fix Gitlab.delete() error reporting on missing arg

Leo Antunes · Leo Antunes · commit f12446ee66bd · 2016-09-16T14:38:41.000+02:00
diff --git a/gitlab/__init__.py b/gitlab/__init__.py
@@ -528,7 +528,7 @@ def delete(self, obj, id=None, **kwargs):
             if k not in params:
                 try:
                     params[k] = getattr(obj, k)
-                except KeyError:
+                except AttributeError:
                     missing.append(k)
         if missing:
             raise GitlabDeleteError('Missing attribute(s): %s' %
