Steps to Reproduce:

1. Import girder.json without importing mongo.json
2. Attempt to add a Girder instance

Expected Behavior:
The API server should prevent you from adding services that contain dependencies that it does not recognize.

Actual Behavior:
The API server adds the service to the catalog anyways, but prevents users from installing it due to the missing dependency.

This ticket is complete when the actual behavior is adjusted to match expectations.