Bug 53201 NPE when re-running newly generated javadoc.xml
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javadocexport/JavadocOptionsManager.java
settings.put(DESTINATION, fDestination);
		if (fAdditionalParams.length() != 0) 
			settings.put(EXTRAOPTIONS, fAdditionalParams);
		if (fVMParams.length() != 0) 
			settings.put(VMOPTIONS, fVMParams);
		if (fOverview.length() != 0) 
			settings.put(OVERVIEW, fOverview);
		if (fStylesheet.length() != 0) 
			settings.put(STYLESHEETFILE, fStylesheet);
		if (fTitle.length() != 0) 
			settings.put(TITLE, fTitle);
		if (checkedProjects.length == 1) {
			updateRecentSettings(checkedProjects[0]);
		}
		getRecentSettings().store(settings);
	}
	public void setAccess(String access) {
		fAccess= access;
	}
	public void setDestination(String destination) {
		fDestination= destination;
	}
	public void setDocletPath(String docletpath) {
		fDocletpath= docletpath;
	}
	public void setDocletName(String docletname) {
		fDocletname= docletname;
	}
	public void setStyleSheet(String stylesheet) {
		fStylesheet= stylesheet;