Small fix for a JSON unit test.

* test/src/json-tests.el (json-parse-string/null): Make JSON object
syntactically valid.  This test is supposed to check whether an
escaped null character causes an error, but without quoting the string
it would be syntactically invalid in any case.
1 job for master in 55 minutes and 21 seconds (queued for 4 seconds)
Status Job ID Name Coverage
passed #1497