Bug 145520 Group name will not show up in group list if the group use default name and key expression has no value
Description: Group name will not show up in group list if key expression has no value. Steps to reproduce: 1. Insert a table into report, bind it to a data set 2. Switch to property editor -> groups 3. Click on add button to open new group dialog, then press ok button Expected result: A new group with default name will be added to group list Actual result: A new group is added to group list, but without group name. But when let group tab lost focus and get focus again, you can see the group name.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
library.setValid( false );
			library.setAllExceptions( e.getExceptionList( ) );
			libraries.add( library );
		}
	}
	/**
	 * Returns all libaries this module contains.
	 * 
	 * @return list of libraries.
	 */
	public List getAllLibraries( )
	{
		return getLibraries( IModuleNameSpace.ARBITARY_LEVEL );
	}
	/**
	 * Returns included libaries within the given depth.
	 * 
	 * @param level
	 *            the given depth
	 * @return list of libraries.
	 * 
	 * @see IModuleNameSpace
	 */
	public List getLibraries( int level )
	{
		if ( level <= IModuleNameSpace.NATIVE_LEVEL || libraries == null )
			return Collections.EMPTY_LIST;
		int newLevel = level - 1;
		
		if ( newLevel == IModuleNameSpace.NATIVE_LEVEL )