message: Warn if something tries to set active namespace to undefined/null/empty.
diff: @@ -23,6 +23,11 @@ export default (state, action) => {
  switch (action.type) {
  case types.setActiveNamespace:
  + if (!action.value) {
  + // eslint-disable-next-line no-console
  + console.warn('setActiveNamespace: Not setting to falsy!');
  + return state;
  + }
  return state.set('activeNamespace', action.value);
  case types.setCurrentLocation:
  