Camera: Handle capture error when checking sensor timestamp

When lens switch happens during zoom, there may be capture error.
In that case, the test should handle by not asserting on missing
capture result.

Test: atest CaptureRequestTest#testZoomTimestampIncrease
Bug: 287143649
Change-Id: Ie4f4eea0ffec76795fa1c24ed40cbb0a16c16f89