ArrayIndexOutOfBoundsException if there is no last name.

Steps to re-produce :
1. open hello.HelloTableView
2. Select "Sort & Filter"
3. Enter only firstname and then Enter

Expected : Either User defied Exception (Invalid entry , need last name, etc) or Don't throw exception.

Current :
Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: 1
        at hello.HelloTableView.lambda$buildSortAndFilterTab$204(HelloTableView.java:619)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
        at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
        at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
        at javafx.event.Event.fireEvent(Unknown Source)
        at javafx.scene.Scene$KeyHandler.process(Unknown Source)
        at javafx.scene.Scene$KeyHandler.access$1800(Unknown Source)
        at javafx.scene.Scene.impl_processKeyEvent(Unknown Source)
        at javafx.scene.Scene$ScenePeerListener.keyEvent(Unknown Source)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(Unknown Source)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleKeyEvent$354(Unknown Source)
        at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(Unknown Source)
        at com.sun.glass.ui.View.handleKeyEvent(Unknown Source)
        at com.sun.glass.ui.View.notifyKey(Unknown Source)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$null$149(Unknown Source)
        at java.lang.Thread.run(Unknown Source)