isScriptHashInput logic fix

[dcousens]

This PR fixes a small mistake in isScriptHashInput which meant a script would throw during classification of a Script rather than return false.

It fixes #344 properly, despite the original test case being fixed by #354.

[dcousens]

I wonder if we should be checking specifically for a RangeError vs this catch all...

[weilu]

I was wondering the same. How about catching all for now and console.debug the exception just in case someone may wonder at which stage the classification returned. Hopefully they report back if it's an unexpected case.

[dcousens]

This is an interesting concept, how would this be any different than returning a console.debug for every other instance where it returned false?

[coveralls]

Coverage increased (+0.0%) to 97.97% when pulling c982622 on scriptfix into d68eb49 on master.

[dcousens]

Will release 1.4.4 after this is merged.

[dcousens]

Going to merge, @weilu if you could still review post-hoc that'd be awesome. :)

[weilu]

I did review and suggested that we console.debug the exception caught. The rest looks good