Gimp XCF export warning when exporting an empty grid

[jazzynico]

Reproduced on Ubuntu 10.04, Inkscape 0.47.

Steps:
1. Create a document with no grid.
2. Export it to Gimp XCF (export grid checked).
3. The document is correctly exported, but the script returns the following unnecessary (from a user's point of view) message:

No matching node for expression: sodipodi:namedview/inkscape:grid[@type='xygrid' and (not(@units) or @units='px')]

[jazzynico (jazzynico)]

Fix committed in the trunk, revision 9699.

The script now tests if a grid exists before exporting it.

The file is available on launchpad (http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/annotate/head%3A/share/extensions/gimp_xcf.py). To test the fix with 0.47 or 0.48, copy the downloaded file to the Inkscape share/extensions folder.

[jazzynico (jazzynico)]

Fix backported to 0.48.x branch (revision 9660).