fix(ios): prevent error

Author: MVP Canvas Template

src/https/request.ios.ts

@@ -83,9 +83,9 @@ function getData(data, encoding?) {
  const nEncoding = encoding === 'ascii' ? NSASCIIStringEncoding : NSUTF8StringEncoding;
  if (data.enumerateKeysAndObjectsUsingBlock || data instanceof NSArray) {
  const serial = NSJSONSerialization.dataWithJSONObjectOptionsError(data, NSJSONWritingOptions.PrettyPrinted);
- content = NSString.alloc().initWithDataEncoding(serial, nEncoding).toString();
+ content = NSString.alloc().initWithDataEncoding(serial, nEncoding)?.toString();
  } else if (data instanceof NSData) {
- content = NSString.alloc().initWithDataEncoding(data, nEncoding).toString();
+ content = NSString.alloc().initWithDataEncoding(data, nEncoding)?.toString();
  } else {
  content = data;
  }