Merge pull request #1 from cocytus/master

Small changes

Author: mabako

.gitignore

@@ -4,3 +4,4 @@ bin/
 
 # user-files
 *.suo
+_ReSharper*/

Git.hub/Client.cs

@@ -81,6 +81,8 @@ public IList<Repository> getRepositories(string username)
             request.AddUrlSegment("name", username);
 
             var list = client.Get<List<Repository>>(request).Data;
+            if (list == null)
+                throw new InvalidOperationException("User does not exist.");
             list.ForEach(r => r._client = client);
             return list;
         }