Add error message for using JSON.OBJLEN on non-existant key
This fixes the missing error message that happens when you run the JSON.OBJLEN command on a key that doesn't exist. (Presently, it returns a blank message.)
I discovered this inconsistency while writing the JSON.OBJLEN page.
Ref: #1353
Investigating test failure...
I'm seeing the tests fail on the current master branch too.
@paulwalrath can you please validate --- FAIL: TestJSONSetWithNXAndXX (0.01s) seems to be failing with your changes.
@paulwalrath can you please validate
--- FAIL: TestJSONSetWithNXAndXX (0.01s)seems to be failing with your changes.
Investigating now.
Sorry about that. Corrected now.
FYI, this PR is ready to be merged.