Do not dereference null pointer for no matching tests (#1191)

When invoking for example

    test_c11_atomics test-that-does-not-exist

parseAndCallCommandLineTests() would attempt to dereference
`resultTestList` which is still a null pointer.

Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>
1 file changed