Fixed Empty message can be posted using Spoiler

[refael]

1.3
It is possible to post a message that all its content is empty spoiler tags

Example
http://xenforo.com/community/threads/spoiler.67130/

 

[Mike]

This has been possible with quote and other tags as well.

 

[Mike]

I've adjusted some code here to deal with this fairly generically I think.

 

[Liam W]

Only for spoilers, it would seem.

Spoiler

Plain tags allow empty posts