2004-02-12  Michael Natterer  <mitch@gimp.org>

	Make sure that non-indexed images never have a colormap.
	Fixes bug #121033.

	* app/core/gimpimage-colormap.c (gimp_image_set_colormap): set
	image->cmap to NULL when called with a NULL colormap.

	* app/core/gimpimage-undo-push.c: made colormap undo/redo aware
	of NULL colormaps.

	* app/core/gimpimage-convert.c (gimp_image_convert): remove the
	colormap using gimp_image_set_colormap() instead of freeing it
	manually.

	* app/widgets/gimpcolormapeditor.c: always check if the image
	is INDEXED *and* has a colormap before accessing the colormap.

	(need this new check because the fixed behaviour of colormap undo
	produces undo groups which, when being popped, make the image have
	no colormap while still being INDEXED in the small time frame
	between the emission of "colormap_changed" and "mode_changed").