Null Reference exception in Solution Explorer context menu

[dcastenholz]

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I found an edge case where the Solution Explorer context menu for 'Generate Code' can cause a null reference exception. Happens only before the extension is loaded, so it is rare. Steps to reproduce are:

1. Load solution with .efmodel file in it.
2. Immediately right-click on .efmodel file and select 'Generate Code'.

Fix:

      private void OnMenuSolutionExplprerGenerateCode(object sender, EventArgs e)
      {
         if (solutionExplorerSelectedFileInfo == null)
         {
            solutionExplorerSelectedFileInfo = new FileInfo(CommandHelper.GetSingleFileSelectedPath());
         }

         CommandHelper.GenerateCode(solutionExplorerSelectedFileInfo.FullName);
      }

in DslPackage\CustomCode\CommandSet.cs