fix: Rework init to avoid crash when server returns null values

Sources/Earthquake Network/Models/EQNManager.m

@@ -62,7 +62,13 @@
 {
     [[ServerRequest defaultServerConnectionSingleton] inviaInformazioniAlServerWithURL:[NSURL URLWithString:EQNServerUrlDownloadSmartphoneNetwork] richiesta:EQNTipoChiamataDownloadDati success:^(id result) {
 
-        self.rete_smartphone = [[EQNReteSmartphone alloc] initWithInfo:result];
+        // Parsiamo la risposta (assicurandoci che non contenga valori nulli)
+        EQNReteSmartphone *rete = [EQNReteSmartphone fromResponse:result];
+        if (rete != nil) {
+            self.rete_smartphone = rete;
+        } else {
+            NSLog(@"[EQNManager] Impossibile parsare la risposta di DownloadSmartphoneNetwork");
+        }
         
         [self performSelectorOnMainThread:@selector(scaricaAreaCheck) withObject:nil waitUntilDone:YES];
     } failure:^(NSError * error) {

Sources/Earthquake Network/Models/EQNReteSmartphone.swift

@@ -21,11 +21,25 @@ class EQNReteSmartphone: NSObject {
     let top10kAvailable: Int
     let top100kAvailable: Int
     
+    // MARK: - Class
+    
+    // Sometimes the response returns a broken response, with all values to null.
+    // In order to avoid crashes due to ObjC-Swift bridging, we need to take a generic nullable object,
+    // and then cast to the expected type (a dictionary).
+    @objc static func from(response: Any?) -> EQNReteSmartphone? {
+        if let info = response as? [[String: Any]?] {
+            return .init(info: info)
+        }
+        return nil
+    }
+    
     // MARK: - Init
     
-    @objc init(info: [[String: Any]]) {
+    private init(info: [[String: Any]?]) {
         // merge array in a single dictionary
-        let allValues = info.reduce([:]) { (result, dictionary) -> [String: Any] in
+        let allValues = info
+            .compactMap { $0 }
+            .reduce([:]) { (result, dictionary) -> [String: Any] in
                 return result.merging(dictionary, uniquingKeysWith: { (_, new) in new })
             }