plugin text commands: fixed log in genericErrback which was raising an exception when something than StanzaError was received

src/plugins/plugin_misc_text_commands.py

@@ -210,7 +210,11 @@ class TextCommands(object):
                     raise failure.Failure(exceptions.CancelError())
 
             def genericErrback(failure):
-                self.feedBack("Command failed with condition '%s'" % failure.value.condition, mess_data, profile)
+                try:
+                    msg = u"with condition {}".format(failure.value.condition)
+                except AttributeError:
+                    msg = u"with error {}".format(failure.value)
+                self.feedBack(u"Command failed {}".format(msg), mess_data, profile)
                 return False
 
             mess_data["unparsed"] = msg[1 + len(command):]  # part not yet parsed of the message