Bug 156497 [Regression][Acceptance]Report isn't refreshed when delete used library file.
Description: Report isn't refreshed when delete used library file. Steps to reproduce: 1.New a library, add a label, input actuate. 2.New a report, extend lib.label 3.Delete the library file. 4.Refresh the report in Outline of the report Expected result: Empty label in Layout. Actual result: label with content "actuate" in Layout.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/LibraryRecord.java
return new LibraryEvent( library, LibraryEvent.DROP );
	}
	/**
	 * Resolves extends references for elements in the <code>module</code>.
	 * During the resolving procedure, cached overridden values are also
	 * distributed.
	 */
	protected void resolveAllElementDescendants( )
	{
		for ( int i = 0; i < module.getDefn( ).getSlotCount( ); i++ )
		{
			int slotId = i;
			if ( slotId == ReportDesign.STYLE_SLOT
					|| slotId == Library.THEMES_SLOT
					|| slotId == ReportDesign.TEMPLATE_PARAMETER_DEFINITION_SLOT )
				continue;
			resolveElementDescendantsInSlot( slotId );
		}
	}
	/**
	 * Resolves extends references for elements in the given slot. During the
	 * resolving procedure, cached overridden values are also distributed.
	 * 
	 * @param slotId
	 *            the slot id
	 */
	private void resolveElementDescendantsInSlot( int slotId )
	{
		ContentIterator contentIter = new ContentIterator( module, slotId );
		while ( contentIter.hasNext( ) )