Small fix for plugins that accept non-channel messages

There's a long explanation in the code of this commit that says this:

> TL;DR OF THE BELOW: if the first parameter looks like a channel in
> addition to message type, then filter by channel. Otherwise, don't
> filter by channel.
>
> Here's the issue: plugins are *usually* multiplexed by channel. But
> that's only for messages that target channels, such as PRIVMSG and JOIN.
> For non-channel messages, such as server status messages (such as 001 on
> connect, or 372 for MOTD, etc) we want to ignore the channel aspect of
> plugin multiplexing. In order to accomplish this, we just check if the
> first parameter looks like a channel - i.e., starts with an octothorpe #.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

omnibot/bot.py

@@ -135,10 +135,27 @@ class Bot:
             # Don't raise on_message events for ourselves.
             return
         line = message.parameters[1]
-        # Filter plugins by get_message_types() and channel
+
+        # TL;DR OF THE BELOW: if the first parameter looks like a channel in
+        # addition to message type, then filter by channel. Otherwise, don't
+        # filter by channel.
+        #
+        # Here's the issue: plugins are *usually* multiplexed by channel. But
+        # that's only for messages that target channels, such as PRIVMSG and
+        # JOIN. For non-channel messages, such as server status messages (such
+        # as 001 on connect, or 372 for MOTD, etc) we want to ignore the channel
+        # aspect of plugin multiplexing.
+        # In order to accomplish this, we just check if the first parameter
+        # looks like a channel - i.e., starts with an octothorpe #.
+        if channel and channel[0] == "#":
+            plugin_pool = self.channel_plugins(channel)
+        else:
+            plugin_pool = self.plugins
+
+        # Filter plugins by get_message_types()
         plugins = [
             plugin
-            for plugin in self.channel_plugins(channel)
+            for plugin in plugin_pool
             if message.command in plugin.get_message_types()
         ]
         if plugins: