Fix bug which causes a crash if palette is not in settings

toot/cli/__init__.py

@@ -49,7 +49,8 @@ def get_default_map():
 
     # TODO: remove in version 1.0
     tui_old = settings.get("tui", {}).copy()
-    del tui_old["palette"]
+    if "palette" in tui_old:
+        del tui_old["palette"]
     if tui_old:
         # TODO: don't show the warning for [toot.palette]
         print_warning("Settings section [tui] has been deprecated in favour of [commands.tui].")