Bug 140542 label can't be displayed without resource file or unmatched key
Steps to reproduce: 1.New a report, add a lable with text "aaa" 2.Add a resource file for the report, set key to "key1", value to "actuate", apply the value to the label 3.Clear the resource file in Property Editor->General->Resource File (or change the key to "abc") 4.Preview the report Expected result: 1.Display label text "aaa" on preview or 2.Give a warning message to say resource file is not found or unmatched key Actual result: Nothing displays on preview
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
*/
	public ConfigVariable findConfigVariabel( String variableName )
	{
		StructureDefn defn = (StructureDefn) MetaDataDictionary.getInstance( )
				.getStructure( ConfigVariable.CONFIG_VAR_STRUCT );
		return (ConfigVariable) StructureRefUtil.findStructure( this, defn,
				variableName );
	}
	/**
	 * Finds an embedded image by name.
	 * 
	 * @param imageName
	 *            the embedded image name
	 * @return the defined image that matches, or <code>null</code> if the
	 *         image name was not found in the embedded images.
	 */
	public EmbeddedImage findImage( String imageName )
	{
		StructureDefn defn = (StructureDefn) MetaDataDictionary.getInstance( )
				.getStructure( EmbeddedImage.EMBEDDED_IMAGE_STRUCT );
		return (EmbeddedImage) StructureRefUtil.findStructure( this, defn,
				imageName );
	}
	/**
	 * Gets the property definition whose detail type is of the given structure
	 * name.
	 * 
	 * @param structureName
	 *            the structure name to search
	 * @return the property definition whose detail type is of the given