fix(dice): handle missing dice roll parameter

Adjust exception handling to catch both ValueError and IndexError. This ensures the command gracefully defaults to 6 sides when input parameters are insufficient or improperly formatted. Improves robustness against user errors.

src/gptbot/commands/dice.py

@@ -9,7 +9,7 @@ async def command_dice(room: MatrixRoom, event: RoomMessageText, bot):
 
     try:
         sides = int(event.body.split()[2])
-    except ValueError:
+    except (ValueError, IndexError):
         sides = 6
 
     if sides < 2: