irclib.bot: don't del sys.modules[badname]

this makes no sense to do on ImportError since that's probably why we
got here. testing, not 100% sure this is right

dr_botzo/ircbot/bot.py

@@ -619,7 +619,7 @@ class IRCBot(irc.client.SimpleIRCClient):
         except ImportError as e:
             log.error("Error loading '{0:s}'".format(plugin_path))
             log.exception(e)
-            del sys.modules[plugin_path]
+            # i don't think this would get populated if __import__ failed del sys.modules[plugin_path]
             if feedback:
                 self.privmsg(dest, "Plugin '{0:s}' could not be loaded: {1:s}".format(plugin_path, e))
         except AttributeError as e: