Is this a bug?

[SoulSu]

1. New a UniversalTranslator with nil fallback, that work fine; ut := New(nil)
2. call ut.AddTranslator to add new translator but t.fallback is nil so will panic. source code

   universal-translator/universal_translator.go

   Line 85 in 7120149

   if t.fallback.Locale() == translator.Locale() {

Whether to add panic handling ?