UPBGE: Fix python component initialization when object added.

Previously we was used iterator to loop on all object but the list can
be reallocated if enough objects are added which cause that the iterator
become invalid.

To fix it we simply use indexes instead.

source/gameengine/Converter/BL_BlenderDataConversion.cpp

@@ -2242,10 +2242,12 @@ void BL_ConvertBlenderObjects(struct Main* maggie,
 		}
 	}
 
-	/* Initialize python components, use a fixed end iterator because some component can add object
-	 * and these objects are only at the end of the list. */
-	for (CListValue::iterator it = objectlist->GetBegin(), end = objectlist->GetEnd(); it != end; ++it) {
-		KX_GameObject *gameobj = (KX_GameObject *)*it;
+	/* Initialize python components, use a fixed size because some component can add object
+	 * and these objects are only at the end of the list. Never use iterato here because the
+	 * begining iterator can be changed and then pointed to a fake game object.
+	 */
+	for (unsigned int i = 0, size = objectlist->GetCount(); i < size; ++i) {
+		KX_GameObject *gameobj = (KX_GameObject *)objectlist->GetValue(i);
 		gameobj->InitComponents();
 	}
 }