Replace organization_uuid unwrap with proper error handling (#6936)

The collection update endpoints (post_collections_update and
post_collections_admin) call .unwrap() on cipher.organization_uuid
in four places. If a user-owned cipher without an organization
somehow reaches these code paths, the server would panic.

Extract the organization UUID early with a descriptive error message
instead of relying on .unwrap(), preventing potential panics and
providing a clear API error response.

Co-authored-by: Daniel García <dani-garcia@users.noreply.github.com>

src/api/core/ciphers.rs

@@ -814,12 +814,16 @@ async fn post_collections_update(
         err!("Collection cannot be changed")
     }
 
+    let Some(ref org_uuid) = cipher.organization_uuid else {
+        err!("Cipher is not owned by an organization")
+    };
+
     let posted_collections = HashSet::<CollectionId>::from_iter(data.collection_ids);
     let current_collections =
         HashSet::<CollectionId>::from_iter(cipher.get_collections(headers.user.uuid.clone(), &conn).await);
 
     for collection in posted_collections.symmetric_difference(&current_collections) {
-        match Collection::find_by_uuid_and_org(collection, cipher.organization_uuid.as_ref().unwrap(), &conn).await {
+        match Collection::find_by_uuid_and_org(collection, org_uuid, &conn).await {
             None => err!("Invalid collection ID provided"),
             Some(collection) => {
                 if collection.is_writable_by_user(&headers.user.uuid, &conn).await {
@@ -850,7 +854,7 @@ async fn post_collections_update(
     log_event(
         EventType::CipherUpdatedCollections as i32,
         &cipher.uuid,
-        &cipher.organization_uuid.clone().unwrap(),
+        org_uuid,
         &headers.user.uuid,
         headers.device.atype,
         &headers.ip.ip,
@@ -890,12 +894,16 @@ async fn post_collections_admin(
         err!("Collection cannot be changed")
     }
 
+    let Some(ref org_uuid) = cipher.organization_uuid else {
+        err!("Cipher is not owned by an organization")
+    };
+
     let posted_collections = HashSet::<CollectionId>::from_iter(data.collection_ids);
     let current_collections =
         HashSet::<CollectionId>::from_iter(cipher.get_admin_collections(headers.user.uuid.clone(), &conn).await);
 
     for collection in posted_collections.symmetric_difference(&current_collections) {
-        match Collection::find_by_uuid_and_org(collection, cipher.organization_uuid.as_ref().unwrap(), &conn).await {
+        match Collection::find_by_uuid_and_org(collection, org_uuid, &conn).await {
             None => err!("Invalid collection ID provided"),
             Some(collection) => {
                 if collection.is_writable_by_user(&headers.user.uuid, &conn).await {
@@ -926,7 +934,7 @@ async fn post_collections_admin(
     log_event(
         EventType::CipherUpdatedCollections as i32,
         &cipher.uuid,
-        &cipher.organization_uuid.unwrap(),
+        org_uuid,
         &headers.user.uuid,
         headers.device.atype,
         &headers.ip.ip,