Fix imported count when exceptions occur

When an exception occurs we need to record any messages and
then continue the loop, otherwise the imported count gets incremented
erroneously.

Author: gnat42

src/Workflow/StepAggregator.php

@@ -163,6 +163,11 @@ public function process()
                 $errors++;
                 $exceptions->attach($e, $index);
                 $this->logger->error($e->getMessage());
+
+                if ($report->hasMessages()) {
+                    $reports->attach($report,$index);
+                }
+                continue;
             }
 
             $imported++;