AddSingleVal doesn't work when attribute is unspecified. #64
Description
(Sorry for the brevity, posting from phone as work proxies no block HTTP POST to github "to prevent uploads" ffs)
In the line starting "setValidationRules(", attribute is used verbatim, whilst it it coalesced with "val" in the previous line. This means options.params can be {"val":"10"} but it tries to use undefined as the key.