[Ecommerce][Bug] Empty mandatory fields does not prevent saving

[NiklasBr]

Bug Report

Expected behavior

Saving a Price Rule condition should not be possible when mandatory fields are empty.

Actual behavior

Saving works, no error messages or indications.

Steps to reproduce

Create a Price Rule condition with a mandatory field.
Save it.

Code example

If this field is left empty, the condition should not be saved, preferably an error message should be displayed.

{
	xtype: "numberfield",
	fieldLabel: "Minimum quantity",
	labelWidth: 200,
	mandatory: true,
	name: "qty",
	maxValue: 100000,
	value: data.qty,
	width: 600,
}

[kingjia90]

Thank you for reporting and for your patience!
Do you have any chance to try this PR #123?