Fixes unhandled fatal error when EPUB content.opf date is badly formatted.

[karenhanson]

We had an EPUB with this value in the content.opf metadata file:

      <opf:meta property="dcterms:modified">
			2012-04-12T12:00:00Z
		</opf:meta>

The EPUB module checks for a valid date. In this case, it was pulling in the whitespace around the value and creating an invalid date. This revealed that the Exception resulting from a badly formatted date would cause the report to crash without proper handling. To replicate it, you can edit the content.opf for an EPUB file and replace the date with the one above.

The reason was that the ErrorMessages.properties file was on the wrong path for the EPUB module (it was with the harvard module messages). Most error messages generated by this module are handled in EpubChecker, which is why this wasn't caught previously... but there are a few generated in JhoveRepInfoReport that are handled separately - those were not working.

To fix, I moved the ErrorMessages.properties to the correct location, and also added a trim() to remove the extra whitespace around the date value, since I don't think this should cause a failure. I did not increment any versions for this yet.

Let me know if you need anything else!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.04%. Comparing base (09cd9c9) to head (9a8e7cb).
Report is 1 commits behind head on integration.

Additional details and impacted files

@@              Coverage Diff               @@
##             integration     #921   +/-   ##
==============================================
  Coverage          47.04%   47.04%           
  Complexity          1103     1103           
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  Files                 57       57           
  Lines               9087     9087           
  Branches            1625     1625           
==============================================
  Hits                4275     4275           
  Misses              4280     4280           
  Partials             532      532           

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