Improves error messsages

LeStorage/Services.swift

@@ -356,8 +356,12 @@ public class Services {
     ///  - data: some JSON data
     fileprivate func errorMessageFromResponse(data: Data) -> String? {
         do {
-            if let jsonObject = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any], let stringsArray = jsonObject.values.first as? [String] {
-                return stringsArray.first
+            if let jsonObject = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] {
+                if let stringsArray = jsonObject.values.first as? [String] {
+                    return stringsArray.first
+                } else if let string = jsonObject.values.first as? String {
+                    return string
+                }
             }
         } catch {
             Logger.log("Failed to parse JSON: \(error.localizedDescription)")