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
nameManager.makeUniqueName( element );
	}
	/**
	 * Gets the name manager of this module.
	 * 
	 * @return the name manager of this module
	 */
	public INameManager getNameManager( )
	{
		return nameManager;
	}
	/**
	 * Returns the file name of the module file.
	 * 
	 * @return the module file name. Returns null if the module has not yet been
	 *         saved to a file.
	 */
	public String getFileName( )
	{
		return fileName;
	}
	/**
	 * Sets the module file name. This method is only called by module reader,
	 * it's illegal to be called for other purpose.
	 * 
	 * @param newName
	 *            the new file name. It may contain relative/absolute path
	 *            information. But this name must include the file name with the
	 *            filename extension.
	 */