httpd: Fix error status code on project not found

It was 500, should be 404.

radicle-httpd/src/api/error.rs

@@ -97,6 +97,7 @@ impl IntoResponse for Error {
                 StatusCode::INTERNAL_SERVER_ERROR,
                 Some(e.message().to_owned()),
             ),
+            Error::Storage(err) if err.is_not_found() => (StatusCode::NOT_FOUND, None),
             Error::BadRequest(msg) => (StatusCode::BAD_REQUEST, Some(msg)),
             other => {
                 tracing::error!("Error: {message}");

radicle-httpd/src/api/v1/projects.rs

@@ -836,6 +836,15 @@ mod routes {
         );
     }
 
+    #[tokio::test]
+    async fn test_projects_not_found() {
+        let tmp = tempfile::tempdir().unwrap();
+        let app = super::router(seed(tmp.path()));
+        let response = get(&app, "/projects/rad:z2u2CP3ZJzB7ZqE8jHrau19yjcfCQ").await;
+
+        assert_eq!(response.status(), StatusCode::NOT_FOUND);
+    }
+
     #[tokio::test]
     async fn test_projects_commits_root() {
         let tmp = tempfile::tempdir().unwrap();