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
library.setValid( false );
			library.setAllExceptions( e.getExceptionList( ) );
			libraries.add( library );
		}
	}
	/**
	 * Returns all libaries this module contains.
	 * 
	 * @return list of libraries.
	 */
	public List getAllLibraries( )
	{
		return getLibraries( IModuleNameSpace.ARBITARY_LEVEL );
	}
	/**
	 * Returns included libaries within the given depth.
	 * 
	 * @param level
	 *            the given depth
	 * @return list of libraries.
	 * 
	 * @see IModuleNameSpace
	 */
	public List getLibraries( int level )
	{
		if ( level <= IModuleNameSpace.NATIVE_LEVEL || libraries == null )
			return Collections.EMPTY_LIST;
		int newLevel = level - 1;
		
		if ( newLevel == IModuleNameSpace.NATIVE_LEVEL )