remove unneeded partial outputs

filterPartialOutputs was not taking into account that some dependent
resources might yet be removed from the graph. Check that they are not
in the targeted set before declaring that the output remain.

terraform/transform_targets.go

@@ -217,6 +217,12 @@ func filterPartialOutputs(v interface{}, targetedNodes *dag.Set, g *Graph) bool
 		if _, ok := d.(*NodeCountBoundary); ok {
 			continue
 		}
+
+		if !targetedNodes.Include(d) {
+			// this one is going to be removed, so it doesn't count
+			continue
+		}
+
 		// as soon as we see a real dependency, we mark this as
 		// non-removable
 		return true