clone: verify if tfs path exists

GitTfs.VsCommon/TfsHelper.Common.cs

@@ -653,5 +653,9 @@ namespace Sep.Git.Tfs.VsCommon
             
         }
 
+        public bool IsExistingInTfs(string path)
+        {
+            return VersionControl.ServerItemExists(path, ItemType.Any);
+        }
     }
 }

GitTfs.VsFake/TfsHelper.VsFake.cs

@@ -375,6 +375,11 @@ namespace Sep.Git.Tfs.VsFake
         {
             throw new NotImplementedException();
         }
+
+        public bool IsExistingInTfs(string path)
+        {
+            throw new NotImplementedException();
+        }
         #endregion
     }
 }

GitTfs/Commands/Clone.cs

@@ -102,6 +102,11 @@ namespace Sep.Git.Tfs.Commands
             if (initBranch != null)
             {
                 var remote = globals.Repository.ReadTfsRemote(GitTfsConstants.DefaultRepositoryId);
+
+                if (!remote.Tfs.IsExistingInTfs(tfsRepositoryPath))
+                    throw new GitTfsException("error: the path " + tfsRepositoryPath + " you want to clone doesn't exist!")
+                        .WithRecommendation("To discover which branch to clone, you could use the command :\ngit tfs list-remote-branches " + remote.TfsUrl);
+
                 if (!remote.Tfs.CanGetBranchInformation)
                     return;
                 var tfsTrunkRepository = remote.Tfs.GetRootTfsBranchForRemotePath(tfsRepositoryPath, false);

GitTfs/Core/TfsInterop/ITfsHelper.cs

@@ -33,5 +33,6 @@ namespace Sep.Git.Tfs.Core.TfsInterop
         IEnumerable<IBranchObject> GetBranches();
         void EnsureAuthenticated();
         void CreateBranch(string sourcePath, string targetPath, int changesetId, string comment = null);
+        bool IsExistingInTfs(string path);
     }
 }