Improve error reporting/resolution.

[FrenjaminBanklin]

#2027 introduced a feature to prevent a module from saving if there are any errors detected in questions throughout the document.

At the moment this is just a standard browser alert. Assuming the existing question input event listeners work - which should prevent authors from leaving a question input if it does not pass a validation check - this should be adequate to prevent authors from saving questions with fatal errors in them.

It would be nice to see this feature expanded to use a dedicated component to provide more context for any existing save-preventing errors and possibly also allow authors to immediately navigate to those errors for quicker resolution.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. We do this to keep our backlog under control, but we thank you for your contributions.