[MC-32840] Game crashes after loading a world in which I had replaced all blocks with air.

Minecraft crashes when I load a world that has and several chunks replaced by air.

These chunks had not been loaded in-game and were generated by MCedit.

Game is not modded. I have tried opening the world in all 1.7 snapshots but am unable to open in 1.6 due to several 1.7 features in the world.

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 27/09/13 7:00 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at aeg.a(SourceFile:122)
	at aeg.a(SourceFile:27)
	at aea.a(SourceFile:354)
	at aev.a(SourceFile:74)
	at agn.a(SourceFile:428)
	at km.a(SourceFile:156)
	at afk.a(SourceFile:778)
	at km.c(SourceFile:93)
	at kl.<init>(SourceFile:28)
	at kk.a(SourceFile:209)
	at kk.a(SourceFile:246)
	at jh.a(SourceFile:151)
	at jh.c(SourceFile:202)
	at jh.a(SourceFile:95)
	at bow.b(SourceFile:72)
	at net.minecraft.server.MinecraftServer.u(SourceFile:487)
	at net.minecraft.server.MinecraftServer.t(SourceFile:404)
	at bot.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:338)
	at jc.run(SourceFile:581)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 13w38c
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_10, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 87169712 bytes (83 MB) / 190185472 bytes (181 MB) up to 2863333376 bytes (2730 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
	AABB Pool Size: 1520 (85120 bytes; 0 MB) allocated, 1520 (85120 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 316 (17696 bytes; 0 MB) allocated, 316 (17696 bytes; 0 MB) used
	Player Count: 1 / 8; [kq['Yodaylay'/126, l='Map', x=-112.17, y=134.90, z=31.96]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.