Fix de-referencing of null pointer in depsgraph

The accessors of original ID and objects are expected to return
nullptr for the nullptr input. This was handled explicitly in the
DEG_get_evaluated_id(), but the DEG_get_evaluated_object was using
`object->id` without check.

While it did not cause actual issue (as the id's offset is 0), this
was causing address sanitizer error print.

Pull Request: https://projects.blender.org/blender/blender/pulls/108939

source/blender/depsgraph/intern/depsgraph_query.cc

@@ -211,6 +211,9 @@ ViewLayer *DEG_get_evaluated_view_layer(const Depsgraph *graph)
 
 Object *DEG_get_evaluated_object(const Depsgraph *depsgraph, Object *object)
 {
+  if (object == nullptr) {
+    return nullptr;
+  }
   return (Object *)DEG_get_evaluated_id(depsgraph, &object->id);
 }