fix a crash when saving a folder

CHANGELOG

@@ -1,5 +1,8 @@
 # Offpunk History
 
+## 1.2 - Unreleased
+- Fixed a crash when trying to save a folder
+
 ## 1.1 - March 18th 2022
 - Perfect rendering of pictures with chafa 1.8+ and compatible terminal (Kitty)
 - timg is supported as an alternative to chafa (with a little glitch)

offpunk.py

@@ -3214,8 +3214,12 @@ see "handler" command to set your own."""
             # Don't use _get_active_tmpfile() here, because we want to save the
             # "source code" of menus, not the rendered view - this way Offpunk
             # can navigate to it later.
-            print("Saved to %s" % filename)
-            shutil.copyfile(gi.get_body(as_file=True), filename)
+            path = gi.get_body(as_file=True)
+            if os.path.isdir(path):
+                print("Can’t save %s because it’s a folder, not a file"%path)
+            else:
+                print("Saved to %s" % filename)
+                shutil.copyfile(path, filename)
 
         # Restore gi if necessary
         if index != None: