[repository] drop usage of no more necessary eschema_eid function
since the previous cset, we are guaranteed that repository's entity schema will
have their eid attribute properly set, so we don't have anymore to check
everytime if some entity schema's .eid attributes is set or not (and retrieve it
if not).
Related to #10450092
<toc resource="main">
<title xml:lang="en">Site documentation</title>
<title xml:lang="fr">Documentation du site</title>
<section resource="standard_usage">
<title xml:lang="en">Standard use</title>
<title xml:lang="fr">Utilisation standard</title>
<section resource="bookmarks">
<title xml:lang="en">Using bookmarks</title>
<title xml:lang="fr">Utilisation des signets</title>
</section>
<section resource="search">
<title xml:lang="en">Search</title>
<title xml:lang="fr">Recherche</title>
</section>
<section resource="userprefs">
<title xml:lang="en">User preferences</title>
<title xml:lang="fr">Préférences utilisateur</title>
</section>
<section resource="add_content">
<title xml:lang="en">Add content to the site</title>
<title xml:lang="fr">Ajouter du contenu au site</title>
</section>
</section>
<section resource="advanced_usage">
<title xml:lang="en">Advanced use</title>
<title xml:lang="fr">Utilisation avancée</title>
<section resource="tut_rql">
<title xml:lang="en">"Relation Query Language" tutorial</title>
<title xml:lang="fr">Tutoriel "Relation Query Language"</title>
</section>
<section resource="custom_view">
<title xml:lang="en">Defining your own views</title>
<title xml:lang="fr">Définir ses propres vues</title>
</section>
</section>
<section resource="glossary">
<title xml:lang="en">Glossary</title>
<title xml:lang="fr">Glossaire</title>
</section>
<section resource="about">
<title xml:lang="fr">A propos de ce site</title>
<title xml:lang="en">About this site</title>
</section>
</toc>