refix the hanging singleton workflow problem with spectre. Fixes bug #10189, again.

docs/changelog/7.x.x.txt

@@ -8,6 +8,7 @@
  - fixed #11857: make page printable?
  - fixed #11891: Shop credit not displayed in payment method screen
  - fixed #11871: Metadata display and criteria builder problems
+ - fixed #10189: pbworkflow000000000007 Hanging
 
 7.10.1
  - fixed #11851: Story Topic: top story variables should be available all the time

lib/WebGUI/Operation/Cron.pm

@@ -308,6 +308,9 @@ sub www_runCronJob {
                 # Run the instance
         my $error = $instance->start( 1 );
         if ($error) {
+            ##Unable to communicate with spectre.  Delete this instance to it does not get stuck.
+            $session->log->error("Unable to communicate with spectre: $error about taskId: $taskId.  Deleting instanceId: ". $instance->getId);
+            $instance->delete();
             return "error";
         }
         $task->delete( 1 ) if ( $task->get("runOnce") );