Empty normalized style should be output the same way as it would not be set

[jodator]

📝 Provide detailed reproduction steps (if any)

Test case:

it( 'should remove normalized properties one by one', () => {
	const stylesProcessor = new StylesProcessor();
	addPaddingRules( stylesProcessor );
	StylesMap._setProcessor( stylesProcessor );
	const stylesMap = new StylesMap();
	stylesMap.setTo( 'padding:1px' );

	stylesMap.remove( 'padding-top' );
	stylesMap.remove( 'padding-right' );
	stylesMap.remove( 'padding-bottom' );
	stylesMap.remove( 'padding-left' );

	expect( stylesMap.toString() ).to.equal( '' );
} );

✔️ Expected result

the tests pass

❌ Actual result

the test does not pass

📃 Other details

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