[CORE][QUEUE] Error checking and type declaration on handling notice queue events

Patch submitted by XRevan86

lib/smsqueuehandler.php

@@ -17,9 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) {
-    exit(1);
-}
+defined('GNUSOCIAL') || die();
 
 /**
  * Queue handler for pushing new notices to local subscribers using SMS.
@@ -31,8 +29,13 @@ class SmsQueueHandler extends QueueHandler
         return 'sms';
     }
 
-    function handle($notice)
+    function handle($notice): bool
     {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not broadcasting");
+            return true;
+        }
+
     	require_once(INSTALLDIR.'/lib/mail.php');
         return mail_broadcast_notice_sms($notice);
     }