Fix running MapShed on AoIs with no streams #2546
Merged
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Overview
Previously, if no streams intersected the area of interest, instead of an array of stringified GeoJSON MultiLines, a singleton array would be sent with the only value being null. This caused parse issues in the geoprocessing service.
Now this case is caught on the Celery task itself, and if so we return an empty object immediately, and do not invoke the geoprocessing service at all. This short circuit makes the feedback faster and removes unnecessary communication.
Connects #2518
Demo
Testing Instructions
Check out this branch and restart Celery
Go to :8000/ and turn on the streams overlay
Draw a shape deliberately avoiding streams
Model with MapShed. Ensure that it works successfully.
Download and run this file: mmw-cli.py.txt, which has the test shape from the original issue.