F# script files doesn't need to exist to be parsed

Fixes #167

Author: juergenhoetzel

fsharp-mode-completion.el

@@ -246,9 +246,8 @@ For indirect buffers return the truename of the base buffer."
 
 (defun fsharp-ac/load-file (file)
   "Start the compiler binding for an individual F# script FILE."
-  (when (and (fsharp-ac--script-file-p file) (file-exists-p file))
-    (unless (fsharp-ac--process-live-p (fsharp-ac--hostname file))
-      (fsharp-ac/start-process))
+  (when (and (fsharp-ac--script-file-p file) (not (fsharp-ac--process-live-p (fsharp-ac--hostname file))))
+    (fsharp-ac/start-process)
     (add-hook 'after-save-hook 'fsharp-ac--load-after-save nil 'local)))
 
 (defun fsharp-ac--load-after-save ()