Guard against empty string namespaces

Signed-off-by: Michel Hidalgo <[email protected]>

bdai_ros2_wrappers/bdai_ros2_wrappers/scope.py

@@ -315,7 +315,7 @@ def load(
                 raise RuntimeError("scope has not been entered (or was already exited)")
             if self._executor is None:
                 raise RuntimeError("scope executor has not been set")
-            if namespace is not None:
+            if namespace:
                 namespace = namespace_with(self._namespace, namespace)
             else:
                 namespace = self._namespace