Fix bug

Author: Nicholas Bergesen

Nick.RobotsParser/RobotsParser.cs

@@ -109,7 +109,7 @@ public async Task<bool> LoadRobotsFromUrl(string robotsUrl)
                 throw new ArgumentException($"Unable to create uri from: {robotsUrl}");
 
             _robotsContent = await WebRequest(robots.ToString());
-            if (!string.IsNullOrWhiteSpace(_robotsContent)) return false;
+            if (string.IsNullOrWhiteSpace(_robotsContent)) return false;
 
             await ParseRobots();
             return true;