(image-type-available-p): Don't reference image-types

if it isn't bound.

lisp/ChangeLog

+2000-05-17  Eli Zaretskii  <eliz@is.elta.co.il>
+
+	* image.el (image-type-available-p): Don't reference image-types
+	if it isn't bound.
+
 2000-05-17  Stefan Monnier  <monnier@cs.yale.edu>
 
 	* autoarg.el (autoarg-mode): Typo in the :set argument.

lisp/image.el

@@ -72,7 +72,7 @@ be determined."
 (defun image-type-available-p (type)
   "Value is non-nil if image type TYPE is available.
 Image types are symbols like `xbm' or `jpeg'."
-  (not (null (memq type image-types))))
+  (and (boundp 'image-types) (not (null (memq type image-types)))))
 
 
 ;;;###autoload