Comment 5 for bug 1427392

Took me a few minutes to get this onto a server where I could test it, but so far looks to do the trick. I was prevented from updating the hard due date to an earlier date value, and then I was able to remove values that I no longer desired.

This feature could probably use a release note entry, but otherwise seems ready enough to go in.

I pushed my signoff on the commit in user/bshum/lp1427392_hard_due_date_value_fixes

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/bshum/lp1427392_hard_due_date_value_fixes