Bug 53201 NPE when re-running newly generated javadoc.xml
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javadocexport/JavadocOptionsManager.java
public final String HREF= "href"; 
	public final String NAME= "name"; 
	public final String PATH= "path"; 
	public final String FROMSTANDARD= "fromStandard"; 
	public final String ANTPATH= "antpath"; 
	public final String SOURCE= "source"; 
	
	private final String SECTION_JAVADOC= "javadoc"; 
	
	public JavadocOptionsManager(IFile xmlJavadocFile, IDialogSettings dialogSettings, List currSelection) {
		fXmlfile= xmlJavadocFile;
		fWizardStatus= new StatusInfo();
		IDialogSettings javadocSection= dialogSettings.getSection(SECTION_JAVADOC); 
		
		fRecentSettings= new RecentSettingsStore(javadocSection);
		
		if (xmlJavadocFile != null) {
			try {
				JavadocReader reader= new JavadocReader(xmlJavadocFile.getContents());
				Element element= reader.readXML();
				if (element != null) {
					loadFromXML(element);
					return;
				}
				fWizardStatus.setWarning(JavadocExportMessages.getString("JavadocOptionsManager.antfileincorrectCE.warning")); 
			} catch (CoreException e) {
				JavaPlugin.log(e);
				fWizardStatus.setWarning(JavadocExportMessages.getString("JavadocOptionsManager.antfileincorrectCE.warning")); 
			} catch (IOException e) {
				JavaPlugin.log(e);