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
return posn;
	}
	/**
	 * Returns the module with the given namespace. This method checks the
	 * namespace in both directly and indirectly included libraries.
	 * 
	 * @param namespace
	 *            the module namespace
	 * @return the module with the given namespace
	 */
	public Library getLibraryWithNamespace( String namespace )
	{
		return getLibraryWithNamespace( namespace,
				IModuleNameSpace.ARBITARY_LEVEL );
	}
	/**
	 * Returns the module with the given namespace. This method checks the
	 * namespace in included libraries within the given depth.
	 * 
	 * @param namespace
	 *            the module namespace
	 * @param level
	 *            the depth of the library
	 * @return the module with the given namespace
	 * 
	 * @see IModuleNameSpace
	 */
	public Library getLibraryWithNamespace( String namespace, int level )
	{
		if ( libraries == null )