fix: [iOS] handle null parsed data (#25)

* fix: iOS crash if parsed data is null

* fix: no error message when a parsed licensed data is invalid

Author: ian-wd

ios/IdscanSdk.m

@@ -56,14 +56,23 @@ - (void)returnScanResult:(ScannerViewController *)controller scanResult:(NSStrin
             parsedData = [mrzParser parse:result];
         }
 
-        [formattedData setObject: @(true) forKey: @"success"];
-        [formattedData setObject: parsedData forKey: @"data"];
+        if (parsedData != nil) {
+          [formattedData setObject: @(true) forKey: @"success"];
+          [formattedData setObject: parsedData forKey: @"data"];
+            
+          self.scannerCallback(@[[NSNull null], formattedData]);
+        } else {
+          [formattedData setObject: @(false) forKey: @"success"];
+          [formattedData setObject: [NSNull null] forKey: @"data"];
+            
+          self.scannerCallback(@[@"Invalid Drivers License", formattedData]);
+        }
     } else {
         [formattedData setObject: @(false) forKey: @"success"];
         [formattedData setObject: [NSNull null] forKey: @"data"];
+        
+        self.scannerCallback(@[[NSNull null], formattedData]);
     }
-
-    self.scannerCallback(@[[NSNull null], formattedData]);
 }
 
 - (NSDictionary *)constantsToExport