jupyter-repl-mode handle yank-excluded-properties t

The value of `yank-excluded-properties' can be t, in which case it is not
possible to `remq' 'field, causing an error. This fix will allow the mode to
start, but does not handle the fact that the 'field property is still stripped.

Author: tgbugs

jupyter-repl.el

@@ -1698,7 +1698,8 @@ Return the buffer switched to."
   (setq-local yank-handled-properties
               (append '((field . jupyter-repl-yank-handle-field-property))
                       yank-handled-properties))
-  (setq-local yank-excluded-properties (remq 'field yank-excluded-properties))
+  (unless (booleanp yank-excluded-properties) ; `yank-excluded-properties' can be set to t
+    (setq-local yank-excluded-properties (remq 'field yank-excluded-properties)))
   ;; Initialize a buffer using the major-mode correponding to the kernel's
   ;; language.  This will be used for indentation and to capture font lock
   ;; properties.