iOs: NSDictionary protected from nil value

Author: RSATom

src/ios/CDVDevice.m

@@ -98,11 +98,14 @@ - (NSDictionary*)deviceProperties
 {
     UIDevice* device = [UIDevice currentDevice];
 
+    NSString* modelVersion = [device modelVersion];
+    NSString* systemVersion = [device systemVersion];
+
     return @{
              @"manufacturer": @"Apple",
-             @"model": [device modelVersion],
+             @"model": modelVersion ? modelVersion : @"",
              @"platform": @"iOS",
-             @"version": [device systemVersion],
+             @"version": systemVersion ? systemVersion : @"",
              @"uuid": [self uniqueAppInstanceIdentifier:device],
              @"cordova": [[self class] cordovaVersion],
              @"isVirtual": @([self isVirtual]),