core, plugins: host.getClient now raise an exception instead of returning None when no profile is found, plugins have been adapted consequently and a bit cleaned

src/plugins/plugin_xep_0100.py

@@ -22,8 +22,7 @@ from sat.core.constants import Const as C
 from sat.core import exceptions
 from sat.tools import xml_tools
 from logging import debug, info, warning, error
-from twisted.words.protocols.jabber import client as jabber_client, jid
-from twisted.words.protocols.jabber import error as jab_error
+from twisted.words.protocols.jabber import jid
 from twisted.internet import reactor, defer
 
 PLUGIN_INFO = {
@@ -161,7 +160,7 @@ class XEP_0100(object):
                 else:
                     try:
                         msg = result.value.condition
-                    except AttibuteError:
+                    except AttributeError:
                         msg = str(result)
                 ret.append((success, (msg, items[idx])))
             else:
@@ -206,7 +205,6 @@ class XEP_0100(object):
         """Find gateways in the target JID, using discovery protocol
         """
         client = self.host.getClient(profile)
-        assert(client)
         debug(_("find gateways (target = %(target)s, profile = %(profile)s)") % {'target': target.full(), 'profile': profile})
         d = client.disco.requestItems(target)
         d.addCallback(self._itemsReceived , target=target, client=client)