Create msu file on export

Author: MattEqualsCoder

MSUScripter/Services/ControlServices/MsuPcmGenerationWindowService.cs

@@ -56,6 +56,11 @@ public void RunGeneration()
 
             List<MsuPcmGenerationSongViewModel> toRetry = [];
 
+            if (!File.Exists(_model.MsuProjectViewModel.MsuPath))
+            {
+                using (File.Create(_model.MsuProjectViewModel.MsuPath)) { }
+            }
+
             Parallel.ForEach(_model.Rows,
                 new ParallelOptions { MaxDegreeOfParallelism = 10, CancellationToken = _cts.Token },
                 ParallelAction);