webui: handle playback_pos response with empty contents

grzegorz_clients/cli.py

@@ -170,11 +170,10 @@ def set_volume(
     if volume.startswith("+") or volume.startswith("-"):
         current_volume = api.get_volume()
         new_volume = max(0, min(100, current_volume + int(volume)))
-        new_volume = int(new_volume)
     else:
         new_volume = int(volume)
 
-    rich.print(api.set_volume(new_volume), file=sys.stderr)
+    rich.print(api.set_volume(volume), file=sys.stderr)
 
 
 if __name__ == "__main__":

grzegorz_clients/remi_ui.py

@@ -294,7 +294,7 @@ class RemiApp(App):
 			except api.APIError:
 				playback_pos = None
 
-			if playback_pos:
+			if playback_pos and isinstance(playback_pos, dict) and playback_pos["current"] and playback_pos["total"]:
 				slider_pos = playback_pos["current"] / playback_pos["total"] * 100
 				current = seconds_to_timestamp(playback_pos["current"])
 				total = seconds_to_timestamp(playback_pos["total"])