calendar: fix calendar exception when calendar does not repeat
Fix for #20171205-E91759
Basically extend the change from 24c836a7 to the case where there's an exception, but the exception does not match and add tests to reproduce the case.
Fix for #20171205-E91759
Basically extend the change from 24c836a7 to the case where there's an exception, but the exception does not match and add tests to reproduce the case.