[mtasc] Reference to undeclared variable

[Nicolas Cannasse]

> Just found one workaround:
> 1. use flasm -d TestDemoLucky.swf > TestDemoLucky.flm
> 2. remove these code:
>    push 'TestDemoLucky'
>    getVariable
>    not
>    not
>    branchIfTrue label11
> 3. flasm -a TestDemoLucky
> Don't know how to do it in mtasc way.

The problem is that it's not compatible with Adobe AS2 compiler, which 
never overwrite a class if it's already defined. This is why this jump 
to the class end is needed.

Nicolas