fallback no longer needed

src/c3nav/mapdata/cache.py

@@ -334,14 +334,7 @@ class GeometryChangeTracker:
         self._unary_unions = {}
 
     def _get_unary_union(self, level_id):
-
-        try:
-            union = self._unary_unions.get(level_id)
-        except AttributeError:
-            # fallback if there are still old pickled updates in the queue
-            self._unary_unions = {}
-            union = None
-
+        union = self._unary_unions.get(level_id)
         if union is None:
             union = unary_union(self._geometries_by_level[level_id])
             self._unary_unions[level_id] = union