two test failures on maint branch

[Kyle Meyer]

Just a heads up: with recent changes on maint, I'm seeing two test
failures:

    2 unexpected results:
       FAILED  test-org-inlinetask/folding-directly-consecutive-tasks/1
       FAILED  test-org/org-read-date

It looks like the first one came with ee3c3b554 (org.el: Allow empty
subtrees to be folded back, 2020-09-05) and the second with c7abcd514
(org.el (org-add-planning-info): Use caller's `org-time-was-given'
value, 2020-09-05).

Note that, for the second, directly running the test with
BTEST_RE='test-org/org-read-date' doesn't seem to trigger it, while
BTEST_RE='test-org/' does, so there's probably an interaction between
tests.

I haven't yet taken a closer look at those commits or the failures.