Simplify completion block of getSignalingSettings

Signed-off-by: Marcel Müller <marcel-mueller@gmx.de>

NextcloudTalk/NCAPIControllerExtensions.swift

@@ -235,11 +235,7 @@ import Foundation
         }
 
         return apiSessionManager.getOcs(urlString, account: account, parameters: parameters) { ocs, error in
-            if let dataDict = ocs?.dataDict {
-                completionBlock(SignalingSettings(dictionary: dataDict), nil)
-            } else {
-                completionBlock(nil, error)
-            }
+            completionBlock(SignalingSettings(dictionary: ocs?.dataDict), error)
         }
     }
 

NextcloudTalk/SignalingSettings.swift

@@ -15,7 +15,9 @@ import Foundation
     public var turnServers: [TurnServer] = []
     public var federation: [String: Any]?
 
-    init(dictionary: [String: Any]) {
+    init?(dictionary: [String: Any]?) {
+        guard let dictionary else { return nil }
+
         super.init()
 
         self.server = dictionary["server"] as? String

NextcloudTalk/TurnServer.swift

@@ -25,7 +25,7 @@ import Foundation
         }
 
         if let turnCredential = dictionary["credential"] as? String {
-            self.credential = turnCredential
+            credential = turnCredential
         }
     }
 }