[MC-123460] JSON parsing exceptions thrown during parsing of pack.mcmeta of data and resource packs are not caught properly

The bug

JSON parsing exceptions, being thrown while the pack.mcmeta file of data or resource packs is read, are not properly caught.
This can cause crashes or incorrect error messages when using /reload.

Resource pack crash: (17w50a) crash-2017-12-21_19.30.27-client.txt

Description: Initializing game

com.google.gson.JsonSyntaxException: java.io.EOFException: End of input at line 1 column 2 path $.
	at com.google.gson.internal.Streams.parse(Streams.java:58)
	at com.google.gson.JsonParser.parse(JsonParser.java:84)
	at com.google.gson.JsonParser.parse(JsonParser.java:59)
	at rl.a(SourceFile:73)
	at rl.a(SourceFile:66)
	at sd.a(SourceFile:35)
	at ry.a(SourceFile:38)
	at sa.a(SourceFile:33)
	at bnh.a(SourceFile:1170)
	at bne.an(SourceFile:437)
	at bne.a(SourceFile:365)
	at net.minecraft.client.main.Main.main(SourceFile:140)

How to reproduce

Download the attached resource pack MC-123460 resource pack.zip
Place the resource pack in the resourcepacks folder of your profile
Start Minecraft
It crashes