Fixes coding issues

LeStorage/Codables/ApiCall.swift

@@ -22,7 +22,7 @@ class ApiCall<T: Storable>: ModelObject, Storable, SomeCall {
     var id: String = Store.randomId()
     
     /// Creation date of the call
-    var creationDate: Date = Date()
+    var creationDate: Date? = Date()
     
     /// The HTTP method of the call: post...
     var method: HTTPMethod

LeStorage/Services.swift

@@ -394,7 +394,7 @@ public class Services {
         let tokenString = deviceToken.map { String(format: "%02x", $0) }.joined()
         let token = DeviceToken(value: tokenString)
 //        Logger.log("Send device token = \(tokenString)")
-        let _: DeviceToken = try await self._runRequest(serviceCall: postDeviceTokenCall, payload: token)
+        let _: Empty = try await self._runRequest(serviceCall: postDeviceTokenCall, payload: token)
     }
     
     /// A method that sends a request to change a user's password