[issue] Import all bundles translations

The Command:

app/console kuma:translator:import --force --bundle all

Crashes with message:

[Exception]
  Directory `/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Reso
  urces/translations` does not exist, translations could not be found.

Not all bundles may have transalation, this is a little fix to continue if a directory can't be found.