improve missing emergency access grantees

instead of returning an empty emergency access contact the entry should
not be added to the list. also the error handling can be improved a bit.

src/api/core/emergency_access.rs

@@ -61,7 +61,9 @@ async fn get_contacts(headers: Headers, mut conn: DbConn) -> Json<Value> {
     let emergency_access_list = EmergencyAccess::find_all_by_grantor_uuid(&headers.user.uuid, &mut conn).await;
     let mut emergency_access_list_json = Vec::with_capacity(emergency_access_list.len());
     for ea in emergency_access_list {
-        emergency_access_list_json.push(ea.to_json_grantee_details(&mut conn).await);
+        if let Some(grantee) = ea.to_json_grantee_details(&mut conn).await {
+            emergency_access_list_json.push(grantee)
+        }
     }
 
     Json(json!({
@@ -95,7 +97,9 @@ async fn get_emergency_access(emer_id: &str, mut conn: DbConn) -> JsonResult {
     check_emergency_access_enabled()?;
 
     match EmergencyAccess::find_by_uuid(emer_id, &mut conn).await {
-        Some(emergency_access) => Ok(Json(emergency_access.to_json_grantee_details(&mut conn).await)),
+        Some(emergency_access) => Ok(Json(
+            emergency_access.to_json_grantee_details(&mut conn).await.expect("Grantee user should exist but does not!"),
+        )),
         None => err!("Emergency access not valid."),
     }
 }

src/db/models/emergency_access.rs

@@ -81,25 +81,32 @@ impl EmergencyAccess {
         })
     }
 
-    pub async fn to_json_grantee_details(&self, conn: &mut DbConn) -> Value {
+    pub async fn to_json_grantee_details(&self, conn: &mut DbConn) -> Option<Value> {
         let grantee_user = if let Some(grantee_uuid) = self.grantee_uuid.as_deref() {
-            Some(User::find_by_uuid(grantee_uuid, conn).await.expect("Grantee user not found."))
+            User::find_by_uuid(grantee_uuid, conn).await.expect("Grantee user not found.")
         } else if let Some(email) = self.email.as_deref() {
-            Some(User::find_by_mail(email, conn).await.expect("Grantee user not found."))
+            match User::find_by_mail(email, conn).await {
+                Some(user) => user,
+                None => {
+                    // remove outstanding invitations which should not exist
+                    let _ = Self::delete_all_by_grantee_email(email, conn).await;
+                    return None;
+                }
+            }
         } else {
-            None
+            return None;
         };
 
-        json!({
+        Some(json!({
             "Id": self.uuid,
             "Status": self.status,
             "Type": self.atype,
             "WaitTimeDays": self.wait_time_days,
-            "GranteeId": grantee_user.as_ref().map_or("", |u| &u.uuid),
-            "Email": grantee_user.as_ref().map_or("", |u| &u.email),
-            "Name": grantee_user.as_ref().map_or("", |u| &u.name),
+            "GranteeId": grantee_user.uuid,
+            "Email": grantee_user.email,
+            "Name": grantee_user.name,
             "Object": "emergencyAccessGranteeDetails",
-        })
+        }))
     }
 }