It is possible to change the "missing block" model using a resource pack.
If you break the model, then the game has no model to call when it has a broken or missing model, causing the game to crash.
The fix is simple, do what was done with the missing texture, and don't allow it to be changed by resource packs (hard code the model).
I know this could be qualified as "don't do things that obviously crash the game", but this is still a bug.
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Description: Tesselating block model
java.lang.NullPointerException: Tesselating block model
at btc.a(SourceFile:105)
at btc.b(SourceFile:51)
at bsb.a(SourceFile:221)
at bsa.b(SourceFile:370)
at bqx.a(SourceFile:163)
at brj.a(SourceFile:1401)
at brc.a(SourceFile:1097)
at brc.b(SourceFile:935)
at bdq.ah(SourceFile:818)
at bdq.f(SourceFile:745)
at net.minecraft.client.main.Main.main(SourceFile:121)Update, the game now crashes as soon as it loads with the broken missing block model.
Of course, it does the same with any other broken model.
After some testing, it seems to be less of a problem, since broken models crash the game instead of returning missing.
The Missing model is now used by blocks with nonexistent damage values, and ones you forgot the model for.
Another update on this bug. The game no longer crashes when loading a broken model, unless it is the MissingNo model.
Please provide a sample crash report for this issue.