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, 4 insertions, 1 deletions

diff --git a/src/swarm/peer/forget.rs b/src/swarm/peer/forget.rs
index ce064a2..a1676b5 100644
--- a/src/swarm/peer/forget.rs
+++ b/src/swarm/peer/forget.rs
@@ -32,7 +32,10 @@ pub(crate) fn affects_forget_records(path: &[String]) -> bool {
 }
 
 fn forgotten_peers(doc: &Document) -> Vec<String> {
-    store::keys_at(doc, &forgotten_dir()).unwrap_or_default()
+    store::keys_at(doc, &forgotten_dir())
+        .ok()
+        .flatten()
+        .unwrap_or_default()
 }
 
 /// The forget records this node acted on: peer → the record as it read then.