Shift that span 2 days give error of already existing shift

[DaniGr]

Since the last update whenever I try to add a shift that spans over midnight, I get an error that there is already a shift existing.

Steps to reproduce:
Here you can see that there are only Shifts for 14th and 15th planned.

Now when I try to add the spanning shift for the 16th I get this warning:

[DaniGr]

Still there in Beta release - tested on April 15th 17:19 on http://beta.volunteer-planner.org