[svn r17729] lp-search: minor: return an empty image path if no imge on db

especially for scorm now

main/inc/lib/search/tool_processors/learnpath_processor.class.php

@@ -106,8 +106,14 @@ class learnpath_processor extends search_processor {
             $img_location = api_get_path(WEB_COURSE_PATH).api_get_course_path($course_id)."/document/";
             $thumbnail_path = str_replace ('.png.html', '_thumb.png', $row['path']);
             $big_img_path = str_replace ('.png.html', '.png', $row['path']);
+            $thumbnail = '';
+            if (!empty($thumbnail_path)) {
               $thumbnail = $img_location . $thumbnail_path;
+            }
+            $image = '';
+            if (!empty($big_img_path)) {
               $image = $img_location . $big_img_path;
+            }
             $name = $row['name'];
         }