trailing spaces in warning

Author: nmdefries

src/acquisition/flusurv/api.py

@@ -324,9 +324,9 @@ def _group_by_epiweek(self, data):
     def _groupid_to_name(self, ageid, sexid, raceid, fluid):
         if ((ageid, sexid, raceid, fluid).count(0) < 3):
             warn(
-                "We expect an obs to represent only a single demographic group at" +
+                "We expect an obs to represent only a single demographic group at " +
                 "a time. This obs represents multiple, with demographic IDs " +
-                f"ageid {ageid}, sexid {sexid}, raceid {raceid}, fluid {fluid}." +
+                f"ageid {ageid}, sexid {sexid}, raceid {raceid}, fluid {fluid}. " +
                 "Skip it."
                 )
             # This obs will be added to the processed data, but won't be