fix file watcher crashing

P3D/Debug/DebugFileWatcher.vb

@@ -20,9 +20,11 @@ Public Class DebugFileWatcher
 
             For Each changedFile In _changedFiles
                 Dim relativeFile = changedFile.Remove(0, projectPath.Length + 1)
-                Dim targetFile = Path.Combine(targetPath, relativeFile)
 
-                File.Copy(changedFile, targetFile, True)
+                If File.Exists(relativeFile) Then
+                    Dim targetFile = Path.Combine(targetPath, relativeFile)
+                    File.Copy(changedFile, targetFile, True)
+                End If
             Next
 
             ' clear the changed files afterwards

P3D/World/SkyDome.vb

@@ -85,6 +85,7 @@
             Roll = Math.PI
         End If
 
+        Dim previousBlendState = Core.GraphicsDevice.BlendState
         Core.GraphicsDevice.BlendState = BlendState.NonPremultiplied
 
         For Each ModelMesh As ModelMesh In SkydomeModel.Meshes
@@ -124,6 +125,9 @@
 
             ModelMesh.Draw()
         Next
+
+        Core.GraphicsDevice.BlendState = previousBlendState
+
     End Sub
 
     Shared DaycycleTextureData() As Color = Nothing