type fixes

Author: dg

src/Application/MicroPresenter.php

@@ -140,7 +140,7 @@ public function redirectUrl(string $url, int $httpCode = Http\IResponse::S302_FO
 	 * Throws HTTP error.
 	 * @throws Nette\Application\BadRequestException
 	 */
-	public function error(string $message = null, int $httpCode = Http\IResponse::S404_NOT_FOUND): void
+	public function error(string $message = '', int $httpCode = Http\IResponse::S404_NOT_FOUND): void
 	{
 		throw new Application\BadRequestException($message, $httpCode);
 	}

src/Application/Responses/JsonResponse.php

@@ -29,7 +29,7 @@ final class JsonResponse implements Nette\Application\IResponse
 	public function __construct($payload, string $contentType = null)
 	{
 		$this->payload = $payload;
-		$this->contentType = $contentType ? $contentType : 'application/json';
+		$this->contentType = $contentType ?: 'application/json';
 	}
 
 

src/Application/UI/Component.php

@@ -316,7 +316,7 @@ public function redirectPermanent(string $destination, $args = []): void
 	 * Throws HTTP error.
 	 * @throws Nette\Application\BadRequestException
 	 */
-	public function error(string $message = null, int $httpCode = Nette\Http\IResponse::S404_NOT_FOUND): void
+	public function error(string $message = '', int $httpCode = Nette\Http\IResponse::S404_NOT_FOUND): void
 	{
 		throw new Nette\Application\BadRequestException($message, $httpCode);
 	}