Various fixes and checks.

app/Repositories/ImportJob/ImportJobRepository.php

@@ -154,6 +154,16 @@ class ImportJobRepository implements ImportJobRepositoryInterface
         throw new FireflyException('Could not create an import job with a unique key after 30 tries.');
     }
 
+    /**
+     * @param int $jobId
+     *
+     * @return ImportJob|null
+     */
+    public function find(int $jobId): ?ImportJob
+    {
+        return $this->user->importJobs()->find($jobId);
+    }
+
     /**
      * @param string $key
      *