sculpt-dev: Update chat link

Also fixed a nullptr crash.

release/scripts/startup/bl_operators/wm.py

@@ -2943,7 +2943,7 @@ link below.
     for line in msg.split("\n"):
         layout.label(text=line)
 
-    url = "https://blender.chat/channel/sculpt-paint-texture-module"
+    url = "https://blender.chat/channel/sculpt-paint-texture"
     props = layout.operator("wm.url_open", text=url)
     props.url = url
 

source/blender/draw/intern/draw_cache_impl_subdivision.cc

@@ -1912,6 +1912,10 @@ static bool draw_subdiv_create_requested_buffers(const Scene *scene,
       BKE_modifiers_findby_session_uuid(ob, &mesh->runtime.subsurf_session_uuid));
   BLI_assert(smd);
 
+  if (!smd) {
+    return false;
+  }
+
   const bool is_final_render = DRW_state_is_scene_render();
 
   SubdivSettings settings;