[MC-211064] Loading in a TrueTypeFont with an out-of-bounds size crashes the game

The bug

Loading in a TrueType font with a size set to an out-of-bounds value (such as -1) in the font JSON causes the game to crash with an IllegalStateException whilst trying to render it. The game will also crash on startup if the resource pack with the font is not removed/disabled.

How to reproduce

Download the attached resource pack and move it to your resource packs folder
Attempt to enable the resource pack

Stack trace

20w51a: crash-2021-01-11_12.35.26-client.txt

Description: Rendering overlay

java.lang.IllegalStateException: Image is not allocated.
	at djw.h(SourceFile:155)
	at djw.b(SourceFile:365)
	at djw.a(SourceFile:359)
	at djw.a(SourceFile:348)
	at djg$a.a(SourceFile:154)
	at dsc.a(SourceFile:52)
	at dsb.a(SourceFile:131)
	at dsb.d(SourceFile:117)
	at it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap.computeIfAbsent(Int2ObjectOpenHashMap.java:479)
	at dsb.b(SourceFile:117)
	at dpz$a.accept(SourceFile:220)
	at age.a(SourceFile:17)
	at age.a(SourceFile:43)
	at afp.b(SourceFile:23)
	at dpz.c(SourceFile:312)
	at dpz.b(SourceFile:167)
	at dpz.a(SourceFile:133)
	at dpz.a(SourceFile:115)
	at dpz.a(SourceFile:73)
	at dqb.a(SourceFile:124)
	at dtp.a(SourceFile:132)
	at dtm.a(SourceFile:75)
	at egc.a(SourceFile:612)
	at dpe.e(SourceFile:1053)
	at dpe.e(SourceFile:688)
	at net.minecraft.client.main.Main.main(SourceFile:215)