Alpha/Client: fix incorrect 'delegate' display.

Signed-off-by: Grégoire Henry <gregoire.henry@tezos.com>

src/proto_alpha/lib_client/client_proto_contracts.ml

@@ -135,15 +135,7 @@ let get_manager cctxt block source =
   | None -> Alpha_services.Contract.manager cctxt block source
 
 let get_delegate cctxt block source =
-  match Contract.is_implicit source with
-  | Some hash -> return hash
-  | None ->
-      Alpha_services.Contract.delegate_opt cctxt
-        block source >>=? function
-      | Some delegate ->
-          return delegate
-      | None ->
-          Alpha_services.Contract.manager cctxt block source
+  Alpha_services.Contract.delegate_opt cctxt block source
 
 let may_check_key sourcePubKey sourcePubKeyHash =
   match sourcePubKey with

src/proto_alpha/lib_client/client_proto_contracts.mli

@@ -51,7 +51,7 @@ val get_delegate:
   #Proto_alpha.rpc_context ->
   Block_services.block ->
   Contract.t ->
-  public_key_hash tzresult Lwt.t
+  public_key_hash option tzresult Lwt.t
 
 module Contract_tags : module type of Client_tags.Tags (struct
     let name = "contract"

src/proto_alpha/lib_client_commands/client_proto_context_commands.ml

@@ -112,7 +112,11 @@ let commands () =
        @@ stop)
       begin fun () (_, contract) (cctxt : Proto_alpha.full) ->
         Client_proto_contracts.get_delegate
-          cctxt cctxt#block contract >>=? fun delegate ->
+          cctxt cctxt#block contract >>=? function
+        | None ->
+            cctxt#message "none" >>= fun () ->
+            return ()
+        | Some delegate ->
             Public_key_hash.rev_find cctxt delegate >>=? fun mn ->
             Public_key_hash.to_source delegate >>=? fun m ->
             cctxt#message "%s (%s)" m