Allow bunting models to be blank, deliberately skipping a position.

fgd/point/comp/comp_prop_rope_bunting.fgd

@@ -9,7 +9,7 @@
 	distance(float) : "Placement Distance" : 0 : "If greater than zero, override Placement Interval, and instead place every this many units."
 
 	model(studio) : "Model" : : "Specifies the model to place. This can either be an MDL which is placed as invidual prop_statics, " +
-		"or a SMD (relative to a game folder) which is merged into the rope model."
+		"or a SMD (relative to a game folder) which is merged into the rope model. Alternatively make it entirely blank to have a chance to randomly skip placing ropes."
 
 	angles(angle) : "Rotation" : "0 0 0" : "Rotate the model by this much, before applying the orientation of the rope. " +
 		"After this is applied, the X axis should be aligned with the rope direction."

transforms/geocable.py

@@ -997,6 +997,9 @@ def place_seg_props(nodes: Iterable[Node], fsys: FileSystem, mesh: Mesh) -> Iter
             ))
 
             conf = rand.choice(weights)
+            if not conf.model:
+                # Deliberately skip placing a prop.
+                continue
             if conf.orient is SegPropOrient.RAND_FULL:
                 # We cover all orientations, so pre-rotation value is irrelevant.
                 angles = Matrix.from_angle(