Handle bad JSON when loading from a file (#685)
Handle bad JSON when loading from a file (#685)

alert() is probably not the best way to communicate the error
back, but it seems to be used in a few place (in this same
file).
eohomegrownapps/musicblocks,eohomegrownapps/musicblocks,Hrishi1999/musicblocks,walterbender/musicblocks,walterbender/musicblocks,Hrishi1999/musicblocks,eohomegrownapps/musicblocks,Hrishi1999/musicblocks,walterbender/musicblocks