fix: remove void communities from chats

crates/core/src/database/memberships.rs

@@ -37,9 +37,15 @@ impl DataManager {
     /// Replace a list of community memberships with the proper community.
     pub async fn fill_communities(&self, list: Vec<CommunityMembership>) -> Result<Vec<Community>> {
         let mut communities: Vec<Community> = Vec::new();
+
         for membership in &list {
+            if membership.community == 0 {
+                continue;
+            }
+
             communities.push(self.get_community_by_id(membership.community).await?);
         }
+
         Ok(communities)
     }