Merge pull request #14312 from spalmstr/Joomla_11

joomla#11 Fix php warning when viewing profiles

CRM/Contact/BAO/Contact/Utils.php

@@ -228,8 +228,9 @@ WHERE  id IN ( $idString )
     $inputLF = CRM_Utils_Array::value(2, $input);
 
     $check = self::generateChecksum($contactID, $inputTS, $inputLF);
-
-    if (!hash_equals($check, $inputCheck)) {
+    // Joomla_11 - If $inputcheck is null without explicitly casting to a string
+    // you get an error.
+    if (!hash_equals($check, (string) $inputCheck)) {
       return FALSE;
     }