Destroyed Gate Should Not Have Vision

[FruityGumGuiltyFruit]

Is your feature request related to a problem? Please describe.
MrDuck557 and I came to the conclusion that it is strange for destroyed gates to have vision.

Describe the solution you'd like
Destroyed Gates should not have vision.

Describe alternatives you've considered
I tried to code a solution by putting this code in the .js files for ZDESTROYED_GATE_N_S and ZDESTROYED_GATE_E_W, but that did not appear to solve it.

this.getVision = function(building, map)
{
   return -1;
};

Additional context