At least with a registration_domain specified, Converse.js busy-loops when requesting a registration form and the server responds with e.g. the following error:

<iq xml:lang='en' from='example.com' type='error' id='d9917b7a-588f-4ef6-8a56-0d6d3ad538ae:sendIQ'>
  <query xmlns='jabber:iq:register'/>
  <error code='500' type='wait'>
    <resource-constraint xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
    <text xml:lang='en' xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'>Too many CAPTCHA requests</text>
  </error>
</iq>

It spits out ERROR: Problem during registration: Strophe.Status is REGIFAIL.

Even though the error is of type='wait', I think it would be better to just abort the request and display the error message.

(Can easily be reproduced by setting registration_domain: 'conversations.im' and reloading the registration dialog a few times.)

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