Added allowempty setting to ISEMAIL validator.

Till Brehm

2016-01-29 a8ab61eeb0beac52d5a1e8c41d549df4ed87bf71

 interface/lib/classes/tform_base.inc.php

@@ -974,6 +974,10 @@
               }
            }
         case 'ISEMAIL':
            if($validator['allowempty'] != 'y') $validator['allowempty'] = 'n';
            if($validator['allowempty'] == 'y' && $field_value == '') {
               //* Do nothing
            } else {
            if(function_exists('filter_var')) {
               if(filter_var($field_value, FILTER_VALIDATE_EMAIL) === false) {
                  $errmsg = $validator['errmsg'];
@@ -984,6 +988,7 @@
                  }
               }
            } else $this->errorMessage .= "function filter_var missing <br />\r\n";
            }
            break;
         case 'ISINT':
            if(function_exists('filter_var') && $field_value < 2147483647) {