#4 Exception on client exit

[Taras Kostiak]

Stack trace(line numbers for rev61):

java.lang.IllegalStateException: Component must have a valid peer
at java.awt.Component$FlipBufferStrategy.getBackBuffer(Component.java:3625)
at java.awt.Component$FlipBufferStrategy.updateInternalBuffers(Component.java:3608)
at java.awt.Component$FlipBufferStrategy.revalidate(Component.java:3702)
at java.awt.Component$FlipBufferStrategy.revalidate(Component.java:3684)
at java.awt.Component$FlipBufferStrategy.getDrawGraphics(Component.java:3676)
at net.sf.jxpilot.test.JXPilotFrame.activeRender(JXPilotFrame.java:541)
at net.sf.jxpilot.test.Client.handleEnd(Client.java:222)
at net.sf.jxpilot.test.NetClient$13.processPacket(NetClient.java:619)
at net.sf.jxpilot.test.NetClient.netPacket(NetClient.java:1608)
at net.sf.jxpilot.test.NetClient.inputLoop(NetClient.java:1218)
at net.sf.jxpilot.test.NetClient.runClient(NetClient.java:1176)
at net.sf.jxpilot.test.Client.runClient(Client.java:95)
at net.sf.jxpilot.test.UDPTest.runClient(UDPTest.java:65)
at net.sf.jxpilot.test.UDPTest.main(UDPTest.java:60)