reimplementaion of fix for QColorDialog on macOS Sierra bug.

doesn't use destructor because destructor causes another crash.

YACReaderLibrary/server/controllers/errorcontroller.h

@@ -0,0 +1,22 @@
+#ifndef ERRORCONTROLLER_H
+#define ERRORCONTROLLER_H
+
+#include "httprequest.h"
+#include "httpresponse.h"
+#include "httprequesthandler.h"
+
+class ErrorController : public HttpRequestHandler {
+	Q_OBJECT
+	Q_DISABLE_COPY(ErrorController);
+public:
+
+	/** Constructor */
+	ErrorController(int errorCode);
+
+	/** Generates the response */
+	void service(HttpRequest& request, HttpResponse& response);
+private:
+	int error;
+};
+
+#endif // ERRORCONTROLLER_H