GPencil: fix separate points/strokes freezing with empty selection

Code would still create an object (without setting up materials), code
for removing unused material slots would then freeze.

Now return/cancel early in case of empty selection.

This came up in T88269 [which is still not fully fixed, transforming
curve edit points clear their GP_STROKE_SELECT flag which now results in
the early exit, should be looked at separately]

Maniphest Tasks: T88269

Differential Revision: https://developer.blender.org/D11252

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_gpencil.h b/source/blender/editors/include/ED_gpencil.h
index e9ac21f60cf..d4ff374dc38 100644
--- a/source/blender/editors/include/ED_gpencil.h
+++ b/source/blender/editors/include/ED_gpencil.h
@@ -144,6 +144,8 @@ bool ED_gpencil_data_owner_is_annotation(struct PointerRNA *owner_ptr);
 bool ED_gpencil_has_keyframe_v3d(struct Scene *scene, struct Object *ob, int cfra);
 
 /* ----------- Stroke Editing Utilities ---------------- */
+bool ED_gpencil_frame_has_selected_stroke(const struct bGPDframe *gpf);
+bool ED_gpencil_layer_has_selected_stroke(const struct bGPDlayer *gpl, const bool is_multiedit);
 
 bool ED_gpencil_stroke_can_use_direct(const struct ScrArea *area, const struct bGPDstroke *gps);
 bool ED_gpencil_stroke_can_use(const struct bContext *C, const struct bGPDstroke *gps);