Fix Undefined index: bugs in BugzillaOutput.class.php on line 85

Notice: Undefined index: bugs in /var/www/wiki/mediawiki/core/extensions/mediawiki-bugzilla/BugzillaOutput.class.php on line 85

Not got the config quite right for a different MW install

I guess the constructor of BugzillaOutput should check that the returned data is halfway valid too...

        $this->query = BugzillaQuery::create($config['type'], $options, $title);

        // Bubble up any query errors
        if( $this->query->error ) {
            $this->error = $this->query->error;
        }

Also trimmed some trailing whitespace at the same time