Bug 153040 Template definition should be removed after the report item is deleted
Steps to reproduce: 1.New a report, extends lib.label 2.Convert the label to template report item, and revert it back to the report item 3.Delete the label 4.Remove the included library Expected result: Library can be removed Actual result: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Model Plug-in ID:org.eclipse.birt.report.model Version:2.1.0.v20060808-0630 Error Code:Error.LibraryException.LIBRARY_HAS_DESCENDENTS Error Message:The library "Lib" can no be dropped because it has descendents "NewLabel" in the current module.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ExtensionModelPropertyDefn.java
* 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#getType()
	 */
	public PropertyType getType( )
	{
		int typeCode = extProperty.getType( );
		MetaDataDictionary dd = MetaDataDictionary.getInstance( );
		return dd.getPropertyType( typeCode );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#getTypeCode()
	 */
	public int getTypeCode( )
	{
		PropertyType type = getType( );
		assert type != null;
		return type.getTypeCode( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#isIntrinsic()
	 */
	public boolean isIntrinsic( )
	{
		return false;
	}
	/*