Fix T87768: `.path_resolve` fails when requested property is None.

Add a version of RNA_path_resolve_full that returns true
when the path resolves to a NULL RNA pointer.

3 files changed, 15 insertions, 1 deletions

diff --git a/source/blender/makesrna/RNA_access.h b/source/blender/makesrna/RNA_access.h
index 76155973982..75057c1a071 100644
--- a/source/blender/makesrna/RNA_access.h
+++ b/source/blender/makesrna/RNA_access.h
@@ -1124,6 +1124,8 @@ bool RNA_path_resolve(PointerRNA *ptr, const char *path, PointerRNA *r_ptr, Prop
 
 bool RNA_path_resolve_full(
     PointerRNA *ptr, const char *path, PointerRNA *r_ptr, PropertyRNA **r_prop, int *r_index);
+bool RNA_path_resolve_full_maybe_null(
+    PointerRNA *ptr, const char *path, PointerRNA *r_ptr, PropertyRNA **r_prop, int *r_index);
 
 /* path_resolve_property() variants ensure that pointer + property both exist */
 bool RNA_path_resolve_property(PointerRNA *ptr,
diff --git a/source/blender/makesrna/intern/rna_access.c b/source/blender/makesrna/intern/rna_access.c
index 75df8f929e8..0ba5b786187 100644
--- a/source/blender/makesrna/intern/rna_access.c
+++ b/source/blender/makesrna/intern/rna_access.c
@@ -5362,6 +5362,18 @@ bool RNA_path_resolve_full(
 }
 
 /**
+ * A version of #RNA_path_resolve_full doesn't check the value of #PointerRNA.data.
+ *
+ * \note While it's correct to ignore the value of #PointerRNA.data
+ * most callers need to know if the resulting pointer was found and not null.
+ */
+bool RNA_path_resolve_full_maybe_null(
+    PointerRNA *ptr, const char *path, PointerRNA *r_ptr, PropertyRNA **r_prop, int *r_index)
+{
+  return rna_path_parse(ptr, path, r_ptr, r_prop, r_index, NULL, NULL, true);
+}
+
+/**
  * Resolve the given RNA Path to find both the pointer AND property
  * indicated by fully resolving the path.
  *
diff --git a/source/blender/python/intern/bpy_rna.c b/source/blender/python/intern/bpy_rna.c
index 9d0755a865d..35acb56e66a 100644
--- a/source/blender/python/intern/bpy_rna.c
+++ b/source/blender/python/intern/bpy_rna.c
@@ -3663,7 +3663,7 @@ static PyObject *pyrna_struct_path_resolve(BPy_StructRNA *self, PyObject *args)
     return NULL;
   }
 
-  if (RNA_path_resolve_full(&self->ptr, path, &r_ptr, &r_prop, &index)) {
+  if (RNA_path_resolve_full_maybe_null(&self->ptr, path, &r_ptr, &r_prop, &index)) {
     if (r_prop) {
       if (index != -1) {
         if (index >= RNA_property_array_length(&r_ptr, r_prop) || index < 0) {