Forgot to catch no-parent-exception

Unfortunately not a specific Exception right now, but we're getting to that.

lib/util.php

@@ -705,6 +705,8 @@ function common_find_mentions($text, $notice)
                 common_log(LOG_WARNING, sprintf('Notice %d author profile id %d does not exist', $origNotice->id, $origNotice->profile_id));
             } catch (ServerException $e) {
                 common_log(LOG_WARNING, __METHOD__ . ' got exception: ' . $e->getMessage());
+            } catch (Exception $e) {
+                // Probably just no parent. Should get a specific NoParentException
             }
         }