Move AuthenticationInfo.ToFetchOptions to extension methods to allow usage with null instance

Author: GeertvanHorrik

src/GitTools.Core/GitTools.Core.Shared/Git/AuthenticationInfo.cs

@@ -7,21 +7,5 @@ public class AuthenticationInfo
         public string Username { get; set; }
         public string Password { get; set; }
         public string Token { get; set; }
-
-        public FetchOptions ToFetchOptions()
-        {
-            var fetchOptions = new FetchOptions();
-
-            if (!string.IsNullOrEmpty(Username))
-            {
-                fetchOptions.CredentialsProvider = (url, user, types) => new UsernamePasswordCredentials
-                {
-                    Username = Username,
-                    Password = Password
-                };
-            }
-
-            return fetchOptions;
-        }
     }
 }

src/GitTools.Core/GitTools.Core.Shared/Git/Extensions/AuthenticationInfoExtensions.cs

@@ -1,11 +1,31 @@
 namespace GitTools.Git
 {
+    using LibGit2Sharp;
     using Logging;
 
     public static class AuthenticationInfoExtensions
     {
         private static readonly ILog Log = LogProvider.GetCurrentClassLogger();
 
+        public static FetchOptions ToFetchOptions(this AuthenticationInfo authenticationInfo)
+        {
+            var fetchOptions = new FetchOptions();
+
+            if (authenticationInfo != null)
+            {
+                if (!string.IsNullOrEmpty(authenticationInfo.Username))
+                {
+                    fetchOptions.CredentialsProvider = (url, user, types) => new UsernamePasswordCredentials
+                    {
+                        Username = authenticationInfo.Username,
+                        Password = authenticationInfo.Password
+                    };
+                }
+            }
+
+            return fetchOptions;
+        }
+
         public static bool IsEmpty(this AuthenticationInfo authenticationInfo)
         {
             if (authenticationInfo == null)