Adds ability to hanndle garbage API keys. Fixes ietf-tools#3412. Commit ready for merge.

 - Legacy-Id: 19382

Author: kesara

ietf/person/models.py

@@ -387,9 +387,9 @@ def validate_key(cls, s):
         assert isinstance(s, bytes)
         try:
             key = base64.urlsafe_b64decode(s)
+            id, salt, hash = struct.unpack(KEY_STRUCT, key)
         except Exception:
             return None
-        id, salt, hash = struct.unpack(KEY_STRUCT, key)
         k = cls.objects.filter(id=id)
         if not k.exists():
             return None