[TIMOB-8262] Android: Layout: When ti.ui.defaultunit is set to an invalid value, views that use the default unit will not be displayed

Steps to reproduce: 1. Put the following code in app.js:

var win = Ti.UI.createWindow({
	backgroundColor:'black'
});

var view = Ti.UI.createView({
	backgroundColor:'white',
	width:300,
	height:300
});

win.add(view);
win.open();

2. In tiapp.xml, replace ti.ui.defaultunit with:

<property name="ti.ui.defaultunit">abc</property>

3. Launch to Android Actual: A white view does not appear. See attachment. Expected: A white square view should appear. Note: * The above code works as expected on iOS. See attachment.