Add regression test for nil values

features/testbot/nil.feature

@@ -0,0 +1,42 @@
+@routing @testbot @nil
+Feature: Testbot - Check assigning nil values
+    Scenario: Assign nil values to all way strings
+        Given the profile file "testbot" extended with
+        """
+        function way_function (way, result)
+            result.name = "name"
+            result.ref = "ref"
+            result.destinations = "destinations"
+            result.pronunciation = "pronunciation"
+            result.turn_lanes_forward = "turn_lanes_forward"
+            result.turn_lanes_backward = "turn_lanes_backward"
+
+            result.name = nil
+            result.ref = nil
+            result.destinations = nil
+            result.pronunciation = nil
+            result.turn_lanes_forward = nil
+            result.turn_lanes_backward = nil
+
+            result.forward_speed = 10
+            result.backward_speed = 10
+            result.forward_mode = mode.driving
+            result.backward_mode = mode.driving
+        end
+        """
+        Given the node map
+            """
+            a   b   c
+
+                d
+            """
+        And the ways
+            | nodes |
+            | ab    |
+            | bc    |
+            | bd    |
+
+        When I route I should get
+            | from | to | route |
+            | a    | d  | ,,    |
+            | d    | a  | ,,    |