Ignore invalid turn points.

Most notably this happened when a route consists only of one large,
unnamed segment (Yours).
BUG: 285455
(cherry picked from commit 1ca79c65)
Also add logic fix (&&=>||) not in original commit.

src/lib/routing/Route.cpp

@@ -28,7 +28,9 @@ void Route::addRouteSegment( const RouteSegment &segment )
         m_bounds = m_bounds.united( segment.bounds() );
         m_distance += segment.distance();
         m_path << segment.path();
-        m_turnPoints << segment.maneuver().position();
+        if ( segment.maneuver().position().longitude() != 0.0 || segment.maneuver().position().latitude() != 0.0 ) {
+            m_turnPoints << segment.maneuver().position();
+        }
         if ( segment.maneuver().hasWaypoint() ) {
             m_waypoints << segment.maneuver().waypoint();
         }