PopColorPicker crashes on empty field

[brickwall2900]

Hello, I was playing around with Skin Composer and encountered this issue.

I was creating colors but when I blanked out the Saturation field, Skin Composer crashes with:

java.lang.RuntimeException: Actor: PopColorPicker$46
	at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:192)
	at com.badlogic.gdx.scenes.scene2d.Actor.fire(Actor.java:152)
	at com.badlogic.gdx.scenes.scene2d.Stage.keyTyped(Stage.java:446)
	at com.badlogic.gdx.InputEventQueue.drain(InputEventQueue.java:64)
	at com.badlogic.gdx.backends.lwjgl3.DefaultLwjgl3Input.update(DefaultLwjgl3Input.java:189)
	at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window.update(Lwjgl3Window.java:378)
	at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.loop(Lwjgl3Application.java:192)
	at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.<init>(Lwjgl3Application.java:166)
	at com.ray3k.skincomposer.desktop.DesktopLauncher.main(DesktopLauncher.java:487)
Caused by: java.lang.RuntimeException: Actor: PopColorPicker$46
	at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:192)
	at com.badlogic.gdx.scenes.scene2d.Actor.fire(Actor.java:152)
	at com.badlogic.gdx.scenes.scene2d.ui.TextField.changeText(TextField.java:632)
	at com.badlogic.gdx.scenes.scene2d.ui.TextField$TextFieldClickListener.keyTyped(TextField.java:1072)
	at com.ray3k.stripe.PopColorPicker$64.keyTyped(PopColorPicker.java:1568)
	at com.badlogic.gdx.scenes.scene2d.InputListener.handle(InputListener.java:57)
	at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:188)
	... 8 more
Caused by: java.lang.NumberFormatException: For input string: ""
	at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
	at java.base/java.lang.Integer.parseInt(Integer.java:672)
	at java.base/java.lang.Integer.parseInt(Integer.java:778)
	at com.ray3k.stripe.PopColorPicker$47.changed(PopColorPicker.java:1219)
	at com.badlogic.gdx.scenes.scene2d.utils.ChangeListener.handle(ChangeListener.java:28)
	at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:188)
	... 14 more

Integer.parseInt fails to an empty field which is the color saturation.
This unfortunately works with any other field in the color picker.