store: keys_at tells no map from an empty one

registry::exists counted any value at _continuum/users as a registry;
keys_at answers None where there is no map, and its users (records,
members, forget records, remakes) say what they make of it.

Auth plan M1 (fix).

1 files changed, 5 insertions, 2 deletions

diff --git a/src/access/registry.rs b/src/access/registry.rs
index e0cbe47..5899bdd 100644
--- a/src/access/registry.rs
+++ b/src/access/registry.rs
@@ -35,12 +35,15 @@ pub(crate) fn user_path(name: &str) -> Vec<String> {
 /// Whether the swarm has a registry: until it has, every user a node lets in may do
 /// everything but write protocol data (`docs/access.md`, A swarm without a registry).
 pub(crate) fn exists(doc: &impl ReadDoc) -> bool {
-    store::is_map(doc, &users_dir())
+    matches!(store::keys_at(doc, &users_dir()), Ok(Some(_)))
 }
 
 /// The registered users' names, sorted.
 pub(crate) fn names(doc: &impl ReadDoc) -> Vec<String> {
-    let mut names = store::keys_at(doc, &users_dir()).unwrap_or_default();
+    let mut names = store::keys_at(doc, &users_dir())
+        .ok()
+        .flatten()
+        .unwrap_or_default();
     names.sort();
     names
 }