Fix issues with random tuples in TreeArgument.

Thanks @micbou for noticing it.
b92c7d3351

jedi/evaluate/arguments.py

@@ -98,10 +98,9 @@ class TreeArguments(AbstractArguments):
         self.trailer = trailer  # Can be None, e.g. in a class definition.
 
     def _split(self):
-        if isinstance(self.argument_node, (tuple, list)):
+        if self.argument_node is None:
-            for el in self.argument_node:
+            return
-                yield 0, el
+
-        else:
         if not (self.argument_node.type == 'arglist' or (
                 # in python 3.5 **arg is an argument, not arglist
                 (self.argument_node.type == 'argument') and

jedi/evaluate/dynamic.py

@@ -156,7 +156,7 @@ def _check_name_for_execution(evaluator, context, compare_node, name, trailer):
     def create_func_excs():
         arglist = trailer.children[1]
         if arglist == ')':
-            arglist = ()
+            arglist = None
         args = TreeArguments(evaluator, context, arglist, trailer)
         if value_node.type == 'funcdef':
             yield value.get_function_execution(args)

jedi/evaluate/syntax_tree.py

@@ -119,7 +119,7 @@ def eval_node(context, element):
 def eval_trailer(context, base_contexts, trailer):
     trailer_op, node = trailer.children[:2]
     if node == ')':  # `arglist` is optional.
-        node = ()
+        node = None
 
     if trailer_op == '[':
         trailer_op, node, _ = trailer.children