Merge master into 1.0rc/master

Author: shana

src/GitHub.Api/Application/ApplicationManagerBase.cs

@@ -56,7 +56,7 @@ public void Run(bool firstRun)
             Logger.Trace("Run - CurrentDirectory {0}", NPath.CurrentDirectory);
 
             var gitExecutablePath = SystemSettings.Get(Constants.GitInstallPathKey)?.ToNPath();
-            if (gitExecutablePath != null && gitExecutablePath.Value.FileExists()) // we have a git path
+            if (gitExecutablePath.HasValue && gitExecutablePath.Value.FileExists()) // we have a git path
             {
                 Logger.Trace("Using git install path from settings: {0}", gitExecutablePath);
                 InitializeEnvironment(gitExecutablePath.Value);
@@ -71,7 +71,7 @@ public void Run(bool firstRun)
                 var findExecTask = new FindExecTask("git", CancellationToken)
                     .FinallyInUI((b, ex, path) =>
                     {
-                        if (b && path != null)
+                        if (b && path.IsInitialized)
                         {
                             //Logger.Trace("FindExecTask Success: {0}", path);
                             InitializeEnvironment(path);