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/MetaDataDictionary.java
throw new MetaDataException(
					MetaDataException.DESIGN_EXCEPTION_MISSING_STRUCT_NAME );
		if ( structures.containsKey( name ) )
			throw new MetaDataException( new String[]{name},
					MetaDataException.DESIGN_EXCEPTION_DUPLICATE_STRUCT_NAME );
		structures.put( name, struct );
	}
	/**
	 * Finds a structure definition by name.
	 * 
	 * @param name
	 *            the structure name
	 * @return the structure, or null if the structure is not found
	 */
	public IStructureDefn getStructure( String name )
	{
		return (IStructureDefn) structures.get( name );
	}
	/**
	 * Returns the element list. Each one is the instance of
	 * <code>IElementDefn</code>.
	 * 
	 * @return the element list.
	 */
	public List getElements( )
	{
		return new ArrayList( elementNameMap.values( ) );
	}
	/**
	 * Returns the structure list. Each one is the instance of