Segmentation fault on 2.0.5

[Maria Jan Matejka]

>> define myvar = false;
>>
>> function something () {
>>     if myvar then {
>>         return false;
>>     }
>>
>>     return true;
>> }
>>
>> protocol device DEVICE {
>>
>> }
>>
>> Could this be because of the new filter code or something else?
> 
> Hello
> 
> Thanks for bugreport. Yes, it is the new filter code, most likely
> it is a bug in handling of statically eliminable (constant-false)
> if statements without else branch.
> 
> Similar issue also happens for empty blocks:
> 
>   if true then { }
> 

What about the attached patch?
Maria
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