crash while pressing space bar using an empty drawing

[arno_b]

Because no test are made to see if the drawing is empty.

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
 at java.util.Vector.elementAt(Vector.java:427)
 at latexDraw.ui.DrawContainer.selectNextFigure(DrawContainer.java:2552)
 at latexDraw.ui.listeners.ShortcutsListener.keyPressed(ShortcutsListener.java:66)
 at java.awt.Component.processKeyEvent(Component.java:6057)
 at java.awt.Component.processEvent(Component.java:5876)
 at java.awt.Container.processEvent(Container.java:2058)
 at java.awt.Window.processEvent(Window.java:1812)
 at java.awt.Component.dispatchEventImpl(Component.java:4466)
 at java.awt.Container.dispatchEventImpl(Container.java:2116)
 at java.awt.Window.dispatchEventImpl(Window.java:2454)
 at java.awt.Component.dispatchEvent(Component.java:4296)
 at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
 at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:704)
 at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:969)
 at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:841)
 at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:668)
 at java.awt.Component.dispatchEventImpl(Component.java:4338)
 at java.awt.Container.dispatchEventImpl(Container.java:2116)
 at java.awt.Window.dispatchEventImpl(Window.java:2454)
 at java.awt.Component.dispatchEvent(Component.java:4296)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:284)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)