Fixing node red crashes to throw errors instead

[ssoleman]

When importing flows into the newer version, which were created using the older versions, it sometimes causes node-red to crash .

In addition, it is possible that when certain expected values are not set (unsure which ones), instead of throwing an error, node-red will crash. (This issue has been fixed for certain values that haven't been set at all,or correctly, but it is possible that there are more lurking... )

Look at throwing an error rather than allowing for node-red to crash.