- Added function isEmptyString to fhc_helper

- Added function isEmptyArray to fhc_helper
- Adapted the code in application/* to use as much as possible this two new functions
- Removed the php function empty almost everywhere

application/models/person/Person_model.php

@@ -236,7 +236,7 @@ class Person_model extends DB_Model
 			{
 				$person = $persons->retval[$i];
 
-				if (!empty($person->sprache))
+				if (!isEmptyString($person->sprache))
 				{
 					$language = $person->sprache;
 					break;