Fixed: GetStateString.

[momintlh]

• Fixed GetStateString, now null / empty strings are working, no more conversion error. based on Errors piping to c# #38

[SaadBazaz]

This fixes half of #38 . The other half is adding the try-catch and piping the errors anyway, so we can have more visibility into the error, and devs can report things to us better.

[SaadBazaz]

Need clarification:
Currently, you've try-catched just one function. Can we have a try-catch over all Playroom JSLib activities? And then pipe the error to Unity as we discussed?

If you have a better plan for it, you can also drop a comment in #40 which explains how you plan to tackle this in future PRs.

[SaadBazaz]

Merging this, because future documentation can be done in #40 .