check for empty name_id before getting data

include/engine/api/route_api.hpp

@@ -173,7 +173,7 @@ class RouteAPI : public BaseAPI
 
                 guidance::trimShortSegments(steps, leg_geometry);
                 leg.steps = guidance::handleRoundabouts(std::move(steps));
-                leg.steps = guidance::collapseTurnInstructions(std::move(leg.steps), facade);
+                leg.steps = guidance::collapseTurnInstructions(std::move(leg.steps));
                 leg.steps = guidance::anticipateLaneChange(std::move(leg.steps));
                 leg.steps = guidance::buildIntersections(std::move(leg.steps));
                 leg.steps = guidance::suppressShortNameSegments(std::move(leg.steps));

include/engine/guidance/collapse_turns.hpp

@@ -20,8 +20,7 @@ namespace guidance
 // Collapsing such turns into a single turn instruction, we give a clearer
 // set of instructionst that is not cluttered by unnecessary turns/name changes.
 OSRM_ATTR_WARN_UNUSED
-std::vector<RouteStep> collapseTurnInstructions(std::vector<RouteStep> steps,
-                                                const datafacade::BaseDataFacade &facade);
+std::vector<RouteStep> collapseTurnInstructions(std::vector<RouteStep> steps);
 
 // A combined turn is a set of two instructions that actually form a single turn, as far as we
 // perceive it. A u-turn consisting of two left turns is one such example. But there are also lots