fix subshell returns

groove/shell/interactive_shell.py

@@ -54,8 +54,8 @@ class CommandPrompt(BasePrompt):
             session=self.manager.session,
             create_ok=True
         )
-        res = self.commands['_playlist'].start()
-        return True and res
+        self.commands['_playlist'].start()
+        return True
 
 
 def start():  # pragma: no cover

groove/shell/playlist.py

@@ -35,12 +35,10 @@ class _playlist(BasePrompt):
         return self._commands
 
     def process(self, cmd, *parts):
-        res = True
         if cmd in self.commands:
-            res = self.commands[cmd](parts)
-        else:
+            return True if self.commands[cmd](parts) else False
         print(f"Command not understood: {cmd}")
-        return res is True
+        return True
 
     def show(self, parts):
         print(self.parent.playlist)