Ungron doesn't work if a string contains only a backslash

[doozr]

Rather an edge case, this:

$ cat test.json 
{"nowork": "\\"}
$ gron test.json 
json = {};
json.nowork = "\\";
$ gron test.json | gron -u
ungron failed for `json.nowork = "\\";`: statement has no value

[tomnomnom]

Thanks for the report :)

This should be fixed as of f915748

Looks like I'd previously tried to be clever instead of being clear.

I've not tagged a release for a while, so I think I'll do that shortly.