Update the job timeout for the variant handler to 3 hours

This is to account for possible slower load times on the demo data which is 3.64M records.
Use a safe access method for key lookups on call

Previous method would fail if the VCF info did not contain all the necessary fields. This failure would be in the form of a KeyError which would cause the transitions to fail resulting in an infinite loop in the sample pipeline handler which would always fail and log STS error with no additional info.