Translation of Empty String

[alecsammon]

Example

{% set foo = "" %}
{% trans foo %}

This returns the header information of the gettext mo file. Although this is standard behavior for gettext it may not be desirable. Suggest modifying to just return an empty string.

[fabpot]

I'm closing all issues/PRs on the i18n extension as I don't use it and I don't have time to maintain it anymore. This repository will be soon deprecated in favor of the twig/*-extra packages, but i18n wont be transferred. If anyone wants to work on the i18n extension, I would recommend to take the code from here and host it on a new repository.