Observed behavior (please include a screenshot if possible)

An error message is shown when selecting a date in the pattern viewer (under the Patterns tab, when viewing a feed version).

Error fetching GTFS entities via GraphQL

- Exception while fetching data (/feed) : Namespace prefix must contain only alpha, numeric, and
underscores. ({"line":7,"column":3})

Expected behavior

No error message is shown, and the patterns for the selected date should be shown.

Steps to reproduce the problem

1. Open a feed version summary page
2. Go to the Patterns tab
3. Select a route and a different date
4. Observe the error message is shown.

Any special notes on configuration used

NA

Version of datatools-ui and datatools-server if applicable (exact commit hash or branch name)

Recent versions of datatools-ui and server.