Gajim show adhoc command when there is none

[misc]

It seems gajim do not validate the answer sent by server when doing adhoc command discovery. Here is the exchange i have seen :

<iq to="epxample.org" type="get" id="218" from="misc@example.org/Gajim">
<query xmlns="http://jabber.org/protocol/disco#items" node="http://jabber.org/protocol/commands" />
</iq>

<iq to='misc@example.org/Gajim' from='example.org' type='result' id='218'>
<query xmlns='http://jabber.org/protocol/disco#items'>
<item jid='chat.example.org' name='' />
</query>
</iq>

The server do not support adhoc command nor advertise it, yet, it answer something ( because it doesn't take in account the node attribute ).

Yet, gajim show a empty windows with a list choice widget without more information.

I think gajim should check the node attribute of answer to prevent such problem ( and of course, my server should not answer to such query, I will take care of that ).

[misc]

Patch to fix the issue

[asterix]

(In [8864]) get command list only if server answer with commands namespace. fixes #3460