Fix interiors bug introduced by #4187

[tederis]

Fixes a crash and interior disappearing when throwing granades inside interiors.

[Dutchman101]

Note: subject is game_sa.dll crash at offset 0x00012AE8 (Bug report #4202 - also see comment)

We were collaborating on investigating it (me, FileEX and TEDERIs) so PR #4208 and #4206 are a conclusive fix.

What was happening is that the whole interior object breaking on explosions like a grenade, the main bug, caused the interior's LOD (going through pLODInterface) to be nullptr as player was streaming out of it when they fell into the sky (interior-less) or died.

As it turned out, the actual reason was related to introduced by #4208 issues. And there's the dedicated PR #4208. But the current PR is still viable as it prevents from potential problems in future.

Yes. As generally speaking, pLODInterface can be nullptr, and even GTA’s own code checks for that—but CBuildingRemovalSA didn’t up until now with PR #4206.

Both PR #4206 and #4208 will be merged now at the same time, so the whole situation is resolved. Thanks for the help!