Additional "," in JSON file makes minecraft reject the resource pack and crashes the launcher

When writing blockmodels, Minecraft suddenly rejected my resource pack and used the fallback one (default).
From the "Game Output" tab in the launcher:

[15:24:27] [Client thread/INFO]: Caught error stitching, removing all assigned resourcepacks
java.lang.NullPointerException
at bot.a(SourceFile:525) ~[1.8.8.jar:?]
at bot.g(SourceFile:421) ~[1.8.8.jar:?]
at bot.j(SourceFile:537) ~[1.8.8.jar:?]
at bot.a(SourceFile:139) ~[1.8.8.jar:?]
at bou.a(SourceFile:23) ~[1.8.8.jar:?]
at bnn.c(SourceFile:104) ~[1.8.8.jar:?]
at bnn.a(SourceFile:92) ~[1.8.8.jar:?]
at ave.e(SourceFile:652) [1.8.8.jar:?]
at ave$8.run(SourceFile:2325) [1.8.8.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_60]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_60]
at g.a(SourceFile:44) [1.8.8.jar:?]
at ave.av(SourceFile:881) [1.8.8.jar:?]
at ave.a(SourceFile:325) [1.8.8.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.8.jar:?]
[15:24:27] [Client thread/INFO]: Reloading ResourceManager: Default

This very descriptive error was produced, because in one of the modelfiles, I put a "," at behind the last element of an JSON array.
(Happens only in the elements tag! When putting a comma behind one of the numbers in the from or to tag, it just says expected 3 values, found 4)

Sometimes (not always) this error even crashed the launcher running in the background. (v1.6.44)