generate_metadata.py - failed upload handling

[chkw]

generate_metadata.py currently handles failed uploads in the following way:

1. reports number of failed uploads
2. writes output from the upload client jar to a log file

Is this sufficient, or should the script do something more elaborate?

[hannes-ucsc]

Not familiar with this particular script, but generally speaking a program should exit with a non-zero exit code if it failed for any part of its inputs. It's ok to do proceed with other inputs after one them failed, but the failure should still result in a non-zero exit code, even if subsequent inputs succeeded.