Add a check for empty comments / JavaDoc tags

[Gama11]

I dislike having auto-generated, empty doc comments like this:

/**
 * 
 * @param   arg
 * @param   pos
 */

[AlexHaxe]

This can either be done by a line based or a token tree based check, AST based checks throw away comments (mainly because there is no node in AST for comments).

I guess for this particular check a line based version would suffice.
If you want to go a step further and check if the @params match the function parameters then you would have to go token tree or have a more complex set of parsing and regex rules for a line based check.