Replace x() by isset(), !empty() or defaults()

- Remove extraneous parentheses around empty() calls
- Remove duplicate calls to intval(), count() or strlen() after empty()
- Replace ternary operators outputting binary value with empty() return value
- Rewrite defaults() without x()

src/Model/Group.php

@@ -33,7 +33,7 @@ class Group extends BaseObject
 	public static function create($uid, $name)
 	{
 		$return = false;
-		if (x($uid) && x($name)) {
+		if (!empty($uid) && !empty($name)) {
 			$gid = self::getIdByName($uid, $name); // check for dupes
 			if ($gid !== false) {
 				// This could be a problem.
@@ -202,7 +202,7 @@ class Group extends BaseObject
 	 */
 	public static function removeByName($uid, $name) {
 		$return = false;
-		if (x($uid) && x($name)) {
+		if (!empty($uid) && !empty($name)) {
 			$gid = self::getIdByName($uid, $name);
 
 			$return = self::remove($gid);