Data Source Sync running with no app ids

[maxachis]

In the database, we're running into a bug where the Data Sources Sync task is running updates despite having nothing to update.

In the tasks__log table, we see this through the following:

Updating data sources with the following ds_app_ids: []

Let's figure this out and squash it!

[maxachis]

Ah, problem was prerequisite check was not as strict as the function for retrieving ds apps. Pushed a change and we'll see the result.

[maxachis]

Looks good! Now it'd just need to get merged into dev.