no transfer of null to parameter of type string

- Fixes: Passing null to parameter #1 ($string) of type string is deprecated

fp-includes/fp-smartyplugins/validate_criteria.isEmail.php

@@ -28,16 +28,15 @@
 /**
  * test if a value is a valid e-mail address
  *
- * @param string $value
- *        	the value being tested
- * @param boolean $empty
- *        	if field can be empty
- * @param
- *        	array params validate parameter values
- * @param
- *        	array formvars form var values
+ * @param string $value the value being tested
+ * @param boolean $empty if field can be empty
+ * @param array params validate parameter values
+ * @param array formvars form var values
  */
 function smarty_validate_criteria_isEmail($value, $empty, &$params, &$formvars) {
+	if (empty($value))
+		return $empty;
+
 	if (strlen($value) == 0)
 		return $empty;
 

fp-includes/fp-smartyplugins/validate_criteria.isURL.php

@@ -35,6 +35,9 @@
  * @param array formvars form var values
  */
 function smarty_validate_criteria_isURL($value, $empty, &$params, &$formvars) {
+	if (empty($value))
+		return $empty;	
+
 	if(strlen($value) == 0)
 		return $empty;