RichTextLabel doesn't clear text internally when set to empty string

[markdibarry]

Tested versions

• Reproducible in master
• Not reproducible in: 4.4.dev5

System information

Godot v4.4.dev (893bbdf) - Linux Mint 22 (Wilma) on X11 - X11 display driver, Single-window, 2 monitors - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 (nvidia; 535.183.01) - 13th Gen Intel(R) Core(TM) i5-13600KF (20 threads)

Issue description

When setting text to empty string in RichTextLabel, the text does not get cleared.

2024-11-30.20-16-42.mp4

Steps to reproduce

1. Create an RTL.
2. Type text.
3. Clear Text

Minimal reproduction project (MRP)

N/A