Fixed (I hope) the error sometimes happening when using floating chunk separation

doc/source/changelog.md

@@ -29,6 +29,7 @@ Ongoing development - `master`
     - `VoxelMesherTransvoxel`: added option to simplify meshes using MeshOptimizer
     - `VoxelToolLodTerrain`: added `copy` function
     - `VoxelToolLodTerrain`: added `get_voxel_f_interpolated` function, useful to obtain interpolated SDF
+    - `VoxelToolLodTerrain`: added a function to separate floating chunks as rigid-bodies in a specified region
     - `VoxelInstanceGenerator`: added extra option to emit from faces more precisely, especially when meshes got simplified (slower than the other options)
     - `VoxelInstancer`: added menu to setup a multimesh item from a scene (similarly to GridMap), which also allows to set up colliders
     - `VoxelInstancer`: added initial support for instancing regular scenes (slower than multimeshes)

edition/voxel_tool_lod_terrain.cpp

@@ -532,6 +532,10 @@ static Array separate_floating_chunks(VoxelTool &voxel_tool, Box3i world_box, No
 			// because we build these buffers from connected groups that had negative SDF.
 			ERR_CONTINUE(mesh.is_null());
 
+			if (is_mesh_empty(mesh)) {
+				continue;
+			}
+
 			// DEBUG
 			// {
 			// 	Ref<VoxelBlockSerializer> serializer;