fix issue with reordering var_args

jedi/evaluate/param.py

@@ -268,6 +268,7 @@ def _reorder_var_args(var_args):
     named_index = None
     new_args = []
     for i, stmt in enumerate(var_args):
+        if isinstance(stmt, pr.Statement):
             if named_index is None and stmt.assignment_details:
                 named_index = i