Throw error if release not found for project

Adds a check to throw a UserInputError when the specified release does not exist for the given project, improving error handling and feedback for invalid release queries.

Author: neSpecc

src/resolvers/project.js

@@ -575,6 +575,10 @@ module.exports = {
       const releasesFactory = factories.releasesFactory;
       const releaseDoc = await releasesFactory.findByProjectAndRelease(project._id, release);
 
+      if (!releaseDoc) {
+        throw new UserInputError(`Release "${release}" not found for this project (id: ${project._id})`);
+      }
+
       let enrichedFiles = Array.isArray(releaseDoc.files) ? releaseDoc.files : [];
 
       // If there are files to enrich, try to get their metadata