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
*         structure name, otherwise null
	 */
	public ElementPropertyDefn getReferencablePropertyDefn( String structureName )
	{
		if ( referencableProperties == null )
		{
			referencableProperties = new HashMap( );
			referencableProperties.put( ConfigVariable.CONFIG_VAR_STRUCT,
					getPropertyDefn( CONFIG_VARS_PROP ) );
			referencableProperties.put( EmbeddedImage.EMBEDDED_IMAGE_STRUCT,
					getPropertyDefn( IMAGES_PROP ) );
			referencableProperties.put( CustomColor.CUSTOM_COLOR_STRUCT,
					getPropertyDefn( COLOR_PALETTE_PROP ) );
		}
		return (ElementPropertyDefn) referencableProperties.get( structureName );
	}
	/**
	 * Returns the list of errors accumulated during a batch operation. These
	 * errors can be serious errors or warnings. Each one is the instance of
	 * <code>ErrorDetail</code>.
	 * 
	 * @return the list of errors or warning
	 */
	public List getAllErrors( )
	{
		return ErrorDetail.convertExceptionList( allExceptions );
	}
	/**
	 * Returns the list of exceptions accumulated during a batch operation. Each
	 * one is the instance of <code>Exception</code>.