handle NoneType in error message

Author: joshuaberetta

src/formpack/version.py

@@ -28,7 +28,7 @@ def __init__(self, labels=[], translations=[]):
                 'Mismatched labels and translations: [{}] [{}] '
                 '{}!={}'.format(
                     ', '.join(labels),
-                    ', '.join(translations),
+                    ', '.join(map(str, translations)),
                     len(labels),
                     len(translations),
                 )

tests/test_exports.py

@@ -13,6 +13,7 @@
 
 from formpack import FormPack
 from formpack.constants import UNTRANSLATED
+from formpack.errors import TranslationError
 from formpack.schema.fields import (
     ValidationStatusCopyField,
     IdCopyField,
@@ -372,9 +373,8 @@ def test_submissions_of_group_exports(self):
 
     def test_translations_labels_mismatch(self):
         title, schemas, submissions = build_fixture('translations_labels_mismatch')
-        fp = FormPack(schemas, title)
-        options = {'versions': 'v1'}
-        export = fp.export(**options).to_dict(submissions)
+        with self.assertRaises(TranslationError) as e:
+            fp = FormPack(schemas, title)
 
     def test_simple_nested_grouped_repeatable(self):
         title, schemas, submissions = build_fixture(