prevent page from blowing up if no remind msg in bundle #7975

[pdurbin]

What this PR does / why we need it:

If the "remind" bundle strings add in PR #7707 and then tweaked in PR #7734 are missing (as could happen when Bundle files from a translation haven't been updated), the page blows up (hangs with a NullPointerException due to a null being used with a .concat operation) when you try to create a dataset or edit the draft.

The solution in this PR is to omit the "remind" message, show the user the old, shorter message, and log to server.log a message that reads "Unable to get reminder string from bundle. Returning empty string."

Which issue(s) this PR closes:

Closes #7975

Special notes for your reviewer:

This seems easier that writing our own version of .concat with null checking.

Suggestions on how to test this:

Create and edit datasets with users that do and don't have the ability to publish. Here are the messages to remove from Bundle.properties during testing:

• dataset.message.publish.remind.draft=If it's ready for sharing, please publish it.
• dataset.message.submit.remind.draft=If it's ready for sharing, please submit it for review.
• dataset.message.publish.remind.version=If it's ready for sharing, please publish it so that others can see these changes.
• dataset.message.submit.remind.version=If it's ready for sharing, please submit it for review so that others can see these changes.

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Yes, a slight change. If the installation of Dataverse is missing the "remind" strings in the Bundle, instead of the full message in green below, the reminder ("If it's ready...") will be omitted.

Is there a release notes update needed for this change?:

No. Just a bug fix.

Additional documentation:

No.

[coveralls]

Coverage decreased (-0.001%) to 19.314% when pulling 6428c34 on 7975-remind into 9d4ca5a on develop.

[sekmiller]

Looks good. thanks.