Ensure the errors from AsyncLazyFailable<TResult>._activeTask are a…

…lways consumed by at least one task (i.e. never bubble up to the worker). pt.3

FiftyOne.Pipeline.CloudRequestEngine/FailHandling/AsyncLazyFailable.cs

@@ -97,7 +97,7 @@ private Task<TResult> GetOrBuildActiveTask()
                 {
                     return _activeTask;
                 }
-                _activeTask = Task.Run(_mainFunc);
+                _activeTask = Task.Run(TryGetNewValue);
                 _errorHandlingTask = ConsumeActiveTaskFailure(_activeTask);
                 return _activeTask;
             }