Update timeline.php

Author: abemedia

site/models/timeline.php

@@ -138,7 +138,7 @@ public function &getData($id = null) {
 			$result->endDate = ($result->endDate>0 ? JHtml::date($result->endDate, 'Y,m,d') : $result->startDate);
 			$result->asset = new stdClass;
 			$result->asset->media = $result->media;
-			$result->asset->thumbnail = JUri::base() . $result->thumbnail;
+			if($result->thumbnail) $result->asset->thumbnail = JUri::base() . $result->thumbnail;
 			$result->asset->credit = $result->credit;
 			$result->asset->caption = $result->caption;
 			unset($result->media, $result->thumbnail, $result->credit, $result->caption);