small refactor in response for login/logout methods to avoid exceptions in logs

rest-api/src/main/java/lcsb/mapviewer/api/users/UserController.java

@@ -56,9 +56,7 @@ public class UserController extends BaseController {
 			cookie.setPath(cookiePath);
 
 			response.addCookie(cookie);
-			response.getWriter().write("{\"info\":\"Login successful. TOKEN returned as a cookie\"}");
-			response.getWriter().flush();
-			response.getWriter().close();
+			result.put("info", "Login successful. TOKEN returned as a cookie");
 			return result;
 		}
 	}
@@ -90,9 +88,7 @@ public class UserController extends BaseController {
 		cookie.setPath(cookiePath);
 
 		response.addCookie(cookie);
-		response.getWriter().write("{\"status\":\"OK\"}");
-		response.getWriter().flush();
-		response.getWriter().close();
+        result.put("status", "OK");
 		return result;
 	}