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
* 
	 * @param theLocation
	 *            the location path to find
	 * @return the library with the given location path if found, otherwise null
	 */
	public Library getLibraryByLocation( String theLocation )
	{
		
		if ( StringUtil.isBlank( theLocation ) )
			return null;
		
		
		List libraries = getLibraries( );
		for ( int i = 0; i < libraries.size( ); i++ )
		{
			Library library = (Library) libraries.get( i );
			if ( theLocation.equalsIgnoreCase( library.getLocation( ) ) )
				return library;
		}
		
		return null;
	}
	/**
	 * Finds a template parameter definition by name in this module and the
	 * included modules.
	 * 
	 * @param name
	 *            name of the template parameter definition to find
	 * @return the template parameter definition, if found, otherwise null.
	 */