Drop domain key on PhameBlog

Summary: Right now you can't create two blogs without a domain name, since it has a unique key on the column. Removing the key.

Test Plan: Create two blogs with no domain name, works as expected. Create two blogs with `cat.dog` as domain name, get duplicate domain error.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9360

Differential Revision: https://secure.phabricator.com/D14915

src/applications/phame/editor/PhameBlogEditor.php

@@ -47,9 +47,14 @@ final class PhameBlogEditor
     switch ($xaction->getTransactionType()) {
       case PhameBlogTransaction::TYPE_NAME:
       case PhameBlogTransaction::TYPE_DESCRIPTION:
-      case PhameBlogTransaction::TYPE_DOMAIN:
       case PhameBlogTransaction::TYPE_STATUS:
         return $xaction->getNewValue();
+      case PhameBlogTransaction::TYPE_DOMAIN:
+        $domain = $xaction->getNewValue();
+        if (!strlen($xaction->getNewValue())) {
+          return null;
+        }
+        return $domain;
     }
   }