org-clock: Fix regression in Clock table
* lisp/org-clock.el (org-clocktable-write-default): Do not raise an
error when :maxlevel is 0. Small refactoring.
* testing/lisp/test-org-clock.el (test-org-clock/clocktable): Split
into ...
(test-org-clock/clocktable/ranges):
(test-org-clock/clocktable/tags):
(test-org-clock/clocktable/scope):
(test-org-clock/clocktable/maxlevel):
(test-org-clock/clocktable/formula): ... these. Add tests.
This fixes regression introduced in
ccf832e83.
Reported-by: Christoph LANGE <math.semantic.web@gmail.com>
<http://permalink.gmane.org/gmane.emacs.orgmode/112091>