kunit: Don't fail test suites if one of them is empty

Empty test suite is okay test suite.

Don't fail the rest of the test suites if one of them is empty.

Fixes: 6ebf5866f2 ("kunit: tool: add Python wrappers for running KUnit tests")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Tested-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/kunit/kunit_parser.py

@@ -241,7 +241,7 @@ def parse_test_suite(lines: List[str], expected_suite_index: int) -> TestSuite:
 		return None
 	test_suite.name = name
 	expected_test_case_num = parse_subtest_plan(lines)
-	if not expected_test_case_num:
+	if expected_test_case_num is None:
 		return None
 	while expected_test_case_num > 0:
 		test_case = parse_test_case(lines)