fixed IndexOutOfBoundsException in RefreshSourceWorker.done

2013-01-07 10:42:01,909 [1430354]  ERROR - com.intellij.ide.IdeEventQueue - Error during dispatching of java.awt.event.InvocationEvent[INVOCATION_DEFAULT,runnable=javax.swing.Timer$DoPostEvent@1ffb94c,notifier=null,catchExceptions=false,when=1357551721894] on sun.awt.windows.WToolkit@688954 
java.lang.IndexOutOfBoundsException: Index: 0
	at java.util.Collections$EmptyList.get(Collections.java:2970)
	at org.sonar.ide.intellij.worker.RefreshSourceWorker.done(RefreshSourceWorker.java:35)
	at javax.swing.SwingWorker$5.run(SwingWorker.java:717)
	at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(SwingWorker.java:814)
	at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:95)
	at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(SwingWorker.java:824)
	at javax.swing.Timer.fireActionPerformed(Timer.java:291)
	at javax.swing.Timer$DoPostEvent.run(Timer.java:221)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:646)
	at java.awt.EventQueue.access$000(EventQueue.java:84)
	at java.awt.EventQueue$1.run(EventQueue.java:607)
	at java.awt.EventQueue$1.run(EventQueue.java:605)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:616)
	at com.intellij.ide.IdeEventQueue.d(IdeEventQueue.java:673)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:498)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:333)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	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)