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
NameSpace namespace = nameSpaces[nameSpace];
		return namespace.getElement( elementName );
	}
	/**
	 * Sets the exceltion list into this module.
	 * 
	 * @param allExceptions
	 *            exception list to set
	 */
	protected void setAllExceptions( List allExceptions )
	{
		this.allExceptions = allExceptions;
	}
	/**
	 * Returns the <code>URL</code> object if the file with
	 * <code>fileName</code> exists. This method takes the following search
	 * steps:
	 * <ul>
	 * <li>Search file taking <code>fileName</code> as absolute file name;
	 * <li>Search file taking <code>fileName</code> as relative file name and
	 * basing "base" property of module;
	 * <li>Search file with the file locator (<code>IResourceLocator</code>)
	 * in session.
	 * </ul>
	 * 
	 * @param fileName
	 *            file name to search
	 * @param fileType
	 *            file type. The value should be one of:
	 *            <ul>