Prevent TestsHelper#push_to_test_gate from raising exceptions.
Improve TestsHelper#push_to_test_gate error reporting.

This method will no longer raise any exception (will print
warning in the logs instead).
Sync fixes from ragent.
Merge remote-tracking branch 'origin/topic/bf_fix_tests_helper' into develop

* origin/topic/bf_fix_tests_helper:
  Improve TestsHelper#push_to_test_gate error reporting.
  Prevent TestsHelper#push_to_test_gate from raising exceptions.