[OMEMO] When we add a new contact, the devicelist is not checked/verified

[Neustradamus]

When we add a new contact and when it is accepted by the contact, the OMEMO devicelist is not checked/verified.

Grey OMEMO icon, not possibility to enabled (red), and "OMEMO encryption is not available for this contact".

Linked to:

<iq id='IQID' from='me@domain.tld' to='contact@domain2.tld' type='get'>
<pubsub xmlns='http://jabber.org/protocol/pubsub'>
<items node='eu.siacs.conversations.axolotl.devicelist'/>
</pubsub>
</iq>

<iq from="contact@domain2.tld" type="result" to="me@domain.tld/Psi+" id="IQID">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<items node="eu.siacs.conversations.axolotl.devicelist">
<item id="ITEMID">
<list xmlns="eu.siacs.conversations.axolotl">
   <device id="DEVICEID1"/>
   <device id="DEVICEIDX"/>
  </list>
</item>
</items>
</pubsub>
</iq>