Fix T64101: Crash entering edit mode with particle system

Explicitly disable particles in edit for now.

Those were not rendered already, but were attempted to be converted
to Cycles structures (if UVs were not needed for hair nothing was
rendered, but if UVs are needed then crash happened).

Would be nice to bring hair in edit mode back, but this is a bit
more involved change, which will be done later.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_particle.c b/source/blender/makesrna/intern/rna_particle.c
index 641bf4128d0..a3178e0407f 100644
--- a/source/blender/makesrna/intern/rna_particle.c
+++ b/source/blender/makesrna/intern/rna_particle.c
@@ -534,6 +534,11 @@ static void rna_ParticleSystem_uv_on_emitter(ParticleSystem *particlesystem,
                                              int uv_no,
                                              float r_uv[2])
 {
+  if (modifier->mesh_final == NULL) {
+    BKE_report(reports, RPT_ERROR, "Object was not yet evaluated");
+    zero_v2(r_uv);
+    return;
+  }
   if (!CustomData_has_layer(&modifier->mesh_final->ldata, CD_MLOOPUV)) {
     BKE_report(reports, RPT_ERROR, "Mesh has no UV data");
     zero_v2(r_uv);