Skip unknown mime types instead of failing

Test: vts-tradefed run vts -m VtsHalMediaOmxStoreV1_0Host

Bug: 112486806
Bug: 111381455
Change-Id: I4a2b02f8bdc69b51bfd6fbb6e6484ecc446dd661
Merged-In: I4a2b02f8bdc69b51bfd6fbb6e6484ecc446dd661
1 file changed