feat: remove queue requirement for skeleton merging

igneous_cli/cli.py

@@ -1228,7 +1228,7 @@ def skeleton_forge(
 
 @skeletongroup.command("merge")
 @click.argument("path", type=CloudPath())
-@click.option('--queue', required=True, help="AWS SQS queue or directory to be used for a task queue. e.g. sqs://my-queue or ./my-queue. See https://github.com/seung-lab/python-task-queue", type=str)
+@click.option('--queue', help="AWS SQS queue or directory to be used for a task queue. e.g. sqs://my-queue or ./my-queue. See https://github.com/seung-lab/python-task-queue", type=str)
 @click.option('--min-cable-length', default=1000, help="Skip objects smaller than this physical path length. Default: 1000 nm", type=float)
 @click.option('--max-cable-length', default=None, help="Skip objects larger than this physical path length. Default: no limit", type=float)
 @click.option('--tick-threshold', default=0, help="Remove small \"ticks\", or branches from the main skeleton one at a time from smallest to largest. Branches larger than this are preserved. Default: no elimination", type=float)