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
* @param name
	 *            the master page name.
	 * @return the master page, if found, otherwise null.
	 */
	public DesignElement findPage( String name )
	{
		return resolveNativeElement( name, PAGE_NAME_SPACE );
	}
	/**
	 * Finds a parameter by name in this module and the included modules.
	 * 
	 * @param name
	 *            The parameter name.
	 * @return The parameter, if found, otherwise null.
	 */
	public DesignElement findParameter( String name )
	{
		return resolveNativeElement( name, PARAMETER_NAME_SPACE );
	}
	/**
	 * Gets a name space.
	 * 
	 * @param ns
	 *            The name space ID.
	 * @return The name space.
	 */
	public NameSpace getNameSpace( int ns )
	{
		assert ns >= 0 && ns < NAME_SPACE_COUNT;
		return nameSpaces[ns];