ILAB date picker updates when no ILAB jobs found

The `fetchILabJobs` action wasn't updating the date picker values from the API
response unless a non-empty list of jobs is returned. This means that on the
initial load, if the default API date range (1 month) doesn't find any jobs,
the displayed list is empty and the date range isn't updated to tell the user
what we've done.

I've seen no ill effects in local testing from simply removing the length
check, and now the date picker is updated correctly.

frontend/src/actions/ilabActions.js

@@ -20,7 +20,7 @@ export const fetchILabJobs =
           ...(offset && { offset }),
         },
       });
-      if (response.status === 200 && response?.data?.results.length > 0) {
+      if (response.status === 200) {
         const startDate = response.data.startDate,
           endDate = response.data.endDate;
         dispatch({