Fix not having a channelid to join a room

#33

Author: Vaelor

mattermost.plug

@@ -5,5 +5,5 @@ Module = mattermost
 [Documentation]
 Description = A Mattermost backend for errbot.
 Author = Christian Plümer
-Version = 2.0.1
+Version = 2.0.2
 Website = https://github.com/Vaelor/errbot-mattermost-backend

src/mattermostRoom.py

@@ -23,6 +23,12 @@ def __init__(self, name=None, channelid=None, teamid=None, bot=None):
 
 		self._teamid = teamid
 		self._id = None if channelid is None else channelid
+		if self._id is None and name is not None:
+			try:
+				self._id = bot.channelname_to_channelid(name)
+			except RoomDoesNotExistError as e:
+				# If the room does not exist, maybe it will be created.
+				log.info(e)
 		self._bot = bot
 		self.driver = bot.driver