fixed getattr with array call

jedi/evaluate_representation.py

@@ -414,6 +414,9 @@ class Execution(Executable):
                         continue
 
                     for arr_name in names:
+                        if not isinstance(arr_name, Instance):
+                            debug.warning('getattr called without str')
+                            continue
                         if len(arr_name.var_args) != 1:
                             debug.warning('jedi getattr is too simple')
                         key = arr_name.var_args[0]

test/completion/classes.py

@@ -495,6 +495,8 @@ getattr()
 getattr(str)
 #? 
 getattr(getattr, 1)
+#? 
+getattr(str, [])
 
 
 class Base():