5b5b542f2f
Matches on open time ranges (i.e. no end date) were not properly handled, as `end` is simply the zero time, which confuses the `.Before()` and `.After()` logic employed here. This commit fixes that by adding the appropriate `.IsZero()` checks and also adds a test case. The current behavior unfortunately broke compatibility with DAVx5, which by default queries only events less than 90 days ago (by using an open time range).
