Fix Test_ExtendedTask_ProcessorInfo CRI test
Fix Test_ExtendedTask_ProcessorInfo CRI test

Test_ExtendedTask_ProcessorInfo had a minor bug, when the
processor info request would return an error and the error was
expected. The test would still proceed to check the processor
count from the response in whicn case the response is nil and
the check results in nil point dereference.

Signed-off-by: Maksim An <b28a1069b720cf3786e288578c9a7f6f01d55828@microsoft.com>

Microsoft/hcsshim