housekeeping

src/app/editor/graphics/gfx_group_editor.cc

@@ -228,6 +228,9 @@ void GfxGroupEditor::DrawSpritesetViewer(bool sheet_only) {
 
 namespace {
 void DrawPaletteFromPaletteGroup(gfx::SnesPalette &palette) {
+  if (palette.empty()) {
+    return;
+  }
   for (int n = 0; n < palette.size(); n++) {
     PushID(n);
     if ((n % 8) != 0) SameLine(0.0f, GetStyle().ItemSpacing.y);