fix the named param issue in the autocompletion

jedi/api/__init__.py

@@ -163,7 +163,8 @@ class Script(object):
                         # Allow access on _definition here, because it's a
                         # public API and we don't want to make the internal
                         # Name object public.
-                        completions.append((p._definition.get_name(), p))
+                        if p._definition.stars == 0:  # no *args/**kwargs
+                            completions.append((p._definition.get_name(), p))
 
             if not path and not isinstance(user_stmt, pr.Import):
                 # add keywords

jedi/api/classes.py

@@ -567,7 +567,9 @@ class Definition(use_metaclass(CachedMetaClass, BaseDefinition)):
                 if isinstance(d, pr.Param):
                     try:
                         return unicode(d.expression_list()[0].name)
-                    except IndexError:
+                    except (IndexError, AttributeError):
+                        # IndexError for syntax error params
+                        # AttributeError for *args/**kwargs
                         pass
                 return None
         elif isinstance(d, iterable.Generator):