"Failed to mimic" error when trying to mimic Vanilla's "Play Selected World" button while no world is selected

[Lagcoder]

Describe the bug
When you mimic the play selected world button, if no world is selected fancymenu will fail to mimic button
To Reproduce
Steps to reproduce the behavior (e.g.):

1. Edit the world selection screen
2. Make a button, and make it mimic the play selected world button
3. Enter the screen, do not click on any worlds and press the button you created
4. See error

Expected behavior
The button should either be greyed out, or shouldn't do anything when clicked.

Game Log
I do not think the game log is required for this bug, but tell me if it is and i will include

Basic Information (please complete the following information):

• OS: Windows
• FancyMenu Version: 3.8.1
• Fabric/Forge/NeoForge Version 21.1.218
• Minecraft Version 1.21.1
• Active Mods: Cloth Config API (Fabric/Forge/NeoForge) (by shedaniel)
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