Improve error handling

[jnu]

• Handles an edge case where quality report raises divide-by-zero error when redaction is empty. We will avoid the zero-div error, so that the upstream error that triggered this condition can be surfaced better.
• Add more exception handling over code blocks that don't perform critical routines, to help minimize number of scenarios where redaction completely breaks and must be retried.
• Bump bc2 version to pick up changes along the same lines in the pipeline processor