Bug 28563 NPE on shutdown when JUnit view wasn't realized
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/ui/TestRunnerViewPart.java
if (kind != IJavaElementDelta.CHANGED || details != IJavaElementDelta.F_CHILDREN) {
						codeHasChanged();
						return false;
					}
					break;
				case IJavaElement.COMPILATION_UNIT:
					ICompilationUnit unit= (ICompilationUnit)delta.getElement();
					
					if (unit.isWorkingCopy()) {
						
						return true;
					} else {
						codeHasChanged();
						return false;
					}
				case IJavaElement.CLASS_FILE:
					
					return true;
				default:
					codeHasChanged();
					return false;	
			}
				
			IJavaElementDelta[] affectedChildren= delta.getAffectedChildren();
			if (affectedChildren == null)
				return true;
	
			for (int i= 0; i < affectedChildren.length; i++) {
				if (!processDelta(affectedChildren[i]))
					return false;