Use unicode in way more cases

jedi/evaluate/analysis.py

@@ -117,8 +117,8 @@ def add_attribute_error(name_context, lookup_context, name):
     # instead of an error, if that happens.
     typ = Error
     if isinstance(lookup_context, AbstractInstanceContext):
-        slot_names = lookup_context.get_function_slot_names('__getattr__') + \
-            lookup_context.get_function_slot_names('__getattribute__')
+        slot_names = lookup_context.get_function_slot_names(u'__getattr__') + \
+            lookup_context.get_function_slot_names(u'__getattribute__')
         for n in slot_names:
             # TODO do we even get here?
             if isinstance(name, CompiledInstanceName) and \