Fixed issue# 766
added empty check in notebook visibility for issue #766 for PR#854

Am not able to reproduce it at my local but you are correct we should kee the empty check. But wondering its already done while setting.
I have put the fix at the source rcloud.is.notebook.visible itself so that other calling faunctions also don't get impacted. I didn't put the isTrue check again as it will always satisfy the condition after defaulting. Please review and let me know if this is fine.
This Fixes 766
This Fixes #766
artifacts
Merge branch 'pr/854' into develop

Conflicts:
	htdocs/js/rcloud_bundle.min.js
correct rcs keys; remove cruft

tagged version code was using top-level keys instead of the .notebook area
also there were a couple places where it made no sense to have tags