Fixes for back translations

server/router/versions/index.js

@@ -21,7 +21,11 @@ module.exports = function (options) {
                         association: db.ArtifactVersion.Chapters
                     },
                     {
-                        association: db.ArtifactVersion.TranslationArtifactVersions
+                        association: db.ArtifactVersion.TranslationArtifactVersions,
+                        where: {
+                            backTranslationFromId: null
+                        },
+                        required: false
                     }
                 ]
             }).then(artifactVersion => {