Text-as with childable cannot work with preserve-blank for component setting

	<component>
		<component-name>a</component-name>
		<component-class&gt;org.zkoss.zul.A</component-class&gt;
		<widget-class&gt;zul.wgt.A</widget-class&gt;
		<text-as childable="true">label</text-as>
			<!-- treat text within the element as the label property if no element inside -->
		<mold>
			<mold-name>default</mold-name>
			<mold-uri>mold/a.js</mold-uri>
			<css-uri>css/a.css.dsp</css-uri>
		</mold>
		<preserve-blank/>
	</component>

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