unbound variables when invoking poly-org-mode

[alanruttenberg]

I fixed as follows:

diff --git a/poly-org.el b/poly-org.el
index 82050cc..6542cbc 100644
--- a/poly-org.el
+++ b/poly-org.el
@@ -98,15 +98,18 @@ Used in :switch-buffer-functions slot."
   (setq-local org-src-fontify-natively nil)
   (setq-local polymode-move-these-minor-modes-from-old-buffer
               (append '(org-indent-mode)
-                      polymode-move-these-minor-modes-from-old-buffer))
+                      (and (boundp 'polymode-move-these-minor-modes-from-old-buffer)
+                           polymode-move-these-minor-modes-from-old-buffer)))
   (setq-local polymode-run-these-before-change-functions-in-other-buffers
               (append '(org-before-change-function
                         org-element--cache-before-change
                         org-table-remove-rectangle-highlight)
-                      polymode-run-these-before-change-functions-in-other-buffers))
+                      (and (boundp 'polymode-run-these-before-change-functions-in-other-buffers)
+                           polymode-run-these-before-change-functions-in-other-buffers)))
   (setq-local polymode-run-these-after-change-functions-in-other-buffers
               (append '(org-element--cache-after-change)
-                      polymode-run-these-after-change-functions-in-other-buffers)))
+                      (and (boundp 'polymode-run-these-after-change-functions-in-other-buffers)
+                           polymode-run-these-after-change-functions-in-other-buffers))))
 
  ;;;###autoload
 (add-to-list 'auto-mode-alist '("\\.org\\'" . poly-org-mode))