[FIX] hr_recruitment: Fix traceback on job creation

Currently, when creating job postion from config menu then
it will generate the traceback of key error.

So in this commit, If job id found in result then assign the
documents_ids of that job else set the false.

TaskID: 2283753

addons/hr_recruitment/models/hr_job.py

@@ -72,7 +72,7 @@ class Job(models.Model):
                 result[attachment.res_id] |= attachment
 
         for job in self:
-            job.document_ids = result[job.id]
+            job.document_ids = result.get(job.id, False)
             job.documents_count = len(job.document_ids)
 
     def _compute_all_application_count(self):