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 List getErrorList( )
	{
		List allErrors = getAllErrors( );
		List list = ErrorDetail.getSemanticErrors( allErrors,
				DesignFileException.DESIGN_EXCEPTION_SEMANTIC_ERROR );
		list.addAll( ErrorDetail.getSemanticErrors( allErrors,
				DesignFileException.DESIGN_EXCEPTION_SYNTAX_ERROR ) );
		return list;
	}
	/**
	 * Returns a list containing warnings during parsing the module file.
	 * 
	 * @return a list containing parsing warnings. Each element in the list is
	 *         <code>ErrorDetail</code>.
	 * 
	 * @see ErrorDetail
	 */
	public List getWarningList( )
	{
		List allErrors = getAllErrors( );
		return ErrorDetail.getSemanticErrors( allErrors,
				DesignFileException.DESIGN_EXCEPTION_SEMANTIC_WARNING );
	}
	/**
	 * Performs a semantic check of this element, and all its contained
	 * elements. Records errors in the module context.
	 * <p>
	 * Checks the contents of this element.
	 *