Python API get/setObject update for Actuators. (SetParent, AddObject, Camera and TrackTo)

* bugfix for BGE python api - SetParent actuator getObject would segfault if the object was not set.
* Added utility function ConvertPythonToGameObject() that can take a GameObject, string or None and set the game object from this since it was being done in a number of places.
* allow setObject(None), since no object is valid for actuators, Python should be able to set this.
* added optional argument for getObject() so it returns the KX_GameObject rather then its name, would prefer this be default but it could break existing games.

1 files changed, 10 insertions, 3 deletions

diff --git a/source/gameengine/Converter/KX_ConvertActuators.cpp b/source/gameengine/Converter/KX_ConvertActuators.cpp
index 53ac730d203..cb2521de9a4 100644
--- a/source/gameengine/Converter/KX_ConvertActuators.cpp
+++ b/source/gameengine/Converter/KX_ConvertActuators.cpp
@@ -540,9 +540,16 @@ void BL_ConvertActuators(char* maggiename,
 						// does the 'original' for replication exists, and 
 						// is it in a non-active layer ?
 						SCA_IObject* originalval = NULL;
-						if (editobact->ob && !(editobact->ob->lay & activeLayerBitInfo))
-							originalval = converter->FindGameObject(editobact->ob);
-						
+						if (editobact->ob)
+						{
+							if (editobact->ob->lay & activeLayerBitInfo)
+							{
+								fprintf(stderr, "Warning, object \"%s\" from AddObject actuator \"%s\" is not in a hidden layer.\n", objectname.Ptr(), uniquename.Ptr());
+							}
+							else {
+								originalval = converter->FindGameObject(editobact->ob);
+							}
+						}
 						MT_Vector3 linvelvec ( KX_BLENDERTRUNC(editobact->linVelocity[0]),
 							KX_BLENDERTRUNC(editobact->linVelocity[1]),
 							KX_BLENDERTRUNC(editobact->linVelocity[2]));