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
* Contents are of type PredefinedStyle.
	 */
	private HashMap predefinedStyles = new HashMap( );
	/**
	 * Map of property value validators, holding the validator name as key. Each
	 * of this map is the instance of <code>IValueValidator</code>.
	 */
	private Map valueValidators = new HashMap( );
	/**
	 * Map of semantic validators, holding the validator name as key. Each of
	 * this map is the instance of <code>AbstractSemanticValidator</code>.
	 */
	private Map semanticValidators = new HashMap( );
	/**
	 * Whether to use validation trigger. This feature will perform
	 * validation once one property or slot is changed.
	 */
	private boolean useValidationTrigger = false;
	/**
	 * The default encryption helper.
	 */
	private IEncryptionHelper encryptionHelper = SimpleEncryptionHelper.getInstance();
	/**
	 * Singleton class, constructor is private.
	 */
	private MetaDataDictionary( )
	{