Bug 36625 "Copy Trace" Action in "Failure Trace" View enabled for empty table.
The "Copy Trace" action should probably be hidden or unavailable when there is nothing in the "Failure Trace" view. Currently the user is given the option to copy a trace of nothing to the clipboard.
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/ui/TestRunnerViewPart.java
fTestInfos.put(testId, new TestRunInfo(testId, testName));
	}
	/*
	 * @see ITestRunListener#testEnded
	 */
	public void testEnded(String testId, String testName){
		postEndTest(testId, testName);
		fExecutedTests++;
	}
	/*
	 * @see ITestRunListener#testFailed
	 */
	public void testFailed(int status, String testId, String testName, String trace){
		TestRunInfo testInfo= getTestInfo(testId);
		if (testInfo == null) {
			testInfo= new TestRunInfo(testId, testName);
			fTestInfos.put(testName, testInfo);
		}
		testInfo.setTrace(trace);
		testInfo.setStatus(status);
		if (status == ITestRunListener.STATUS_ERROR)
			fErrors++;
		else
			fFailures++;
		if (fFirstFailure == null)
			fFirstFailure= testInfo;
		
		if (fShowOnErrorOnly && (fErrors + fFailures == 1)) 
			postShowTestResultsView();
	}