Don't crash when connecting a debug preview to an input

doc/source/changelog.md

@@ -38,7 +38,9 @@ Godot 4 is required from this version.
     - `VoxelBuffer`: frequently creating buffers with always different sizes no longer wastes memory
     - `Voxel`: properties of the inspector were not refreshed when changing `geometry_type`
     - `VoxelGeneratorGraph`: editor: fix inspector starting to throw errors after deleting a node, as it is still inspecting it
+    - `VoxelGeneratorGraph`: editor: fixed crash when connecting an SdfPreview node to an input. However this is not supported yet.
     - `VoxelGeneratorGraph`: fixed Image2D node not accepting image formats L8 and LA8
+    - `VoxelMesherTransvoxel`: fixed surface not appearing if it lines up exactly at integer coordinates
     - `VoxelTerrain`: fixed `Condition "mesh_block == nullptr" is true` which could happen in some conditions
     - `VoxelTool`: `raycast` locking up if you send a Vector3 containing NaN
     - `VoxelInstancer`: fix instances not refreshing when an item is modified and the mesh block size is 32

editor/graph/voxel_graph_editor.cpp

@@ -723,6 +723,11 @@ void VoxelGraphEditor::update_slice_previews() {
 		Image &im = **info.control->get_image();
 		ERR_FAIL_COND(im.get_width() * im.get_height() != static_cast<int>(buffer.size));
 
+		// TODO Support debugging inputs
+		ERR_CONTINUE_MSG(buffer.data == nullptr,
+				buffer.is_binding ? "Plugging a debug view on an input is not supported yet."
+								  : "Didn't expect buffer to be null");
+
 		unsigned int i = 0;
 		for (int y = 0; y < im.get_height(); ++y) {
 			for (int x = 0; x < im.get_width(); ++x) {