also add a general error message when there is issue whith error handling

erp5/util/testnode/testnode.py

@@ -471,6 +471,8 @@ branch = %(branch)s
           sleep_time = 120 - (now-begin)
           log("End of processing, going to sleep %s" % sleep_time)
           time.sleep(sleep_time)
+    except:
+      log("Exception in error handling", exc_info=sys.exc_info())
     finally:
       # Nice way to kill *everything* generated by run process -- process
       # groups working only in POSIX compilant systems