empty reversed issue, fixes traceback of #408

jedi/evaluate/stdlib.py

@@ -86,7 +86,7 @@ def builtins_super(evaluator, obj, params):
 
 
 def builtins_reversed(evaluator, obj, params):
-    objects = _follow_param(evaluator, params, 0)
+    objects = tuple(_follow_param(evaluator, params, 0))
     if objects:
         # unpack the iterator values
         objects = tuple(iterable.get_iterator_types(objects))

test/completion/std.py

@@ -20,6 +20,10 @@ def yielder():
 #? 
 next(reversed(yielder()))
 
+# empty reversed should not raise an error
+#? 
+next(reversed())
+
 #? str()
 next(open(''))