Python: Raise an error even NO_MAIN data is assigned to object

The goal is to prevent assignment of temporary or evaluated meshes
to objects from the main database.

Majority of the change is actually related on passing reports around.

On a positive side there are more error prints which can become more
visible to scripters.

There are still possible further improvements in the related areas.
For example, disable user counting for evaluated ID datablocks when
assignment happens. But can also happen later on as a separate
improvement.

Reviewers: brecht, campbellbarton, mont29

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4884

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/editors/interface/interface.c b/source/blender/editors/interface/interface.c
index 0e4b07f4b48..f1724d92402 100644
--- a/source/blender/editors/interface/interface.c
+++ b/source/blender/editors/interface/interface.c
@@ -2772,7 +2772,7 @@ bool ui_but_string_set(bContext *C, uiBut *but, const char *str)
       }
       else if (type == PROP_POINTER) {
         if (str[0] == '\0') {
-          RNA_property_pointer_set(&but->rnapoin, but->rnaprop, PointerRNA_NULL);
+          RNA_property_pointer_set(NULL, &but->rnapoin, but->rnaprop, PointerRNA_NULL);
           return true;
         }
         else {
@@ -2788,14 +2788,14 @@ bool ui_but_string_set(bContext *C, uiBut *but, const char *str)
            * Fact remains, using editstr as main 'reference' over whole search button thingy
            * is utterly weak and should be redesigned imho, but that's not a simple task. */
           if (prop && RNA_property_collection_lookup_string(&ptr, prop, str, &rptr)) {
-            RNA_property_pointer_set(&but->rnapoin, but->rnaprop, rptr);
+            RNA_property_pointer_set(NULL, &but->rnapoin, but->rnaprop, rptr);
           }
           else if (but->func_arg2 != NULL) {
             RNA_pointer_create(NULL,
                                RNA_property_pointer_type(&but->rnapoin, but->rnaprop),
                                but->func_arg2,
                                &rptr);
-            RNA_property_pointer_set(&but->rnapoin, but->rnaprop, rptr);
+            RNA_property_pointer_set(NULL, &but->rnapoin, but->rnaprop, rptr);
           }
 
           return true;