git commit -a -m "back to normal"
'
+test_expect_success 'noop filter-branch complains' '
+ test_must_fail git filter-branch \
+ --force --prune-empty \
+ --index-filter "true"
+'
+
test_expect_success 'filter commands are still checked' '
test_must_fail git filter-branch \
--force --prune-empty \