XF2 Addons [MMO] Hide Bb-Code Content System 2.3.3

Hidden content add-on for the XenForo 2 forum

Fix blank lines issue when selected
Fix self-xss

Fix ErrorException: [E_DEPRECATED] preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in src/addons/MMO/Hide/BbCode/Tag/Hide.php at line 34