Add error handling if tar is not made

[amhanson9]

package()

Have had cases where the tar is not made. Capture results from subprocess and test for errors. Could not use move_error due to Permissions problem. I think 7zip must not let go of the file but there doesn't seem to be a way to close it (should be automatic). I tried absolute and relative paths and making sure the paths exist, but no luck. Instead, I'm having manifest() check if an AIP exists and if not it stops. If so, it finishes the log as complete. Don't need to do this for zip because if the tar can run, it should be able to zip.

For testing, can reproduce the error by changing the source path in the tar command.