If a resourcepack tries to use a .ttf that doesn't exist, the game crashes

When trying to load a resourcepack that uses a .ttf file in its default.json font, the game will crash if the file does not exist. If the resourcepack was selected before the game closed, it will crash while trying to load it on startup. Attachead are the crash report and the resourcepack I used to recreate the issue.

19w14b\: [^crash-2019-04-10_15.59.57-client.txt]

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 10/04/19 15:59
Description: Rendering overlay

java.lang.NullPointerException: Rendering overlay
	at cxl$1.b(SourceFile:112)
	at cxl$1.a(SourceFile:53)
	at xf.b(SourceFile:11)
	at xf$$Lambda$1618/566132982.get(Unknown Source)
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1582)
	at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1574)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
	at cxl$1.b(SourceFile:112)
	at cxl$1.a(SourceFile:53)
	at xf.b(SourceFile:11)
	at xf$$Lambda$1618/566132982.get(Unknown Source)
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1582)
	at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1574)

-- Overlay render details --
Details:
	Overlay name: cyw
Stacktrace:
	at djw.a(SourceFile:678)
	at cux.d(SourceFile:945)
	at cux.b(SourceFile:410)
	at net.minecraft.client.main.Main.main(SourceFile:154)

-- System Details --
Details:
	Minecraft Version: 19w14b
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1973666496 bytes (1882 MB) / 3489660928 bytes (3328 MB) up to 4294967296 bytes (4096 MB)
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx4G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Launched Version: 19w14b
	LWJGL: 3.2.1 build 12
	OpenGL: GeForce GTX 760/PCIe/SSE2 GL version 4.6.0 NVIDIA 417.71, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: vanilla, file/Crash
	Current Language: English (US)
	CPU: 8x Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz