abort when writing rgf format

[David Lechner]

rgf is an image format used on LEGO MINDSTORMS EV3.

When trying to convert an image to the rgf format using `convert`, the program aborts.

Example

$ convert mindstorms.bmp mindstorms.rgf
convert: ../../coders/rgf.c:345: WriteRGFImage: Assertion `exception != (ExceptionInfo *) NULL' failed.
Aborted (core dumped)

[David Lechner (dlech)]

This patch is tested working on Ubuntu 16.04.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "fix-abort-on-write-rgf.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[David Lechner (dlech)]

This patch has been accepted upstream: https://github.com/ImageMagick/ImageMagick/pull/223

It would be nice to get it in xenial-updates if possible.

[Launchpad Janitor (janitor)]

This bug was fixed in the package imagemagick - 8:6.9.6.6+dfsg-1ubuntu3

---------------
imagemagick (8:6.9.6.6+dfsg-1ubuntu3) zesty; urgency=medium

  * debian/patches/0020-Revert-GradientImage-change.patch: Revert patch
    per https://github.com/ImageMagick/ImageMagick/issues/316. Thanks
    to Cristy <email address hidden>. Closes LP: #1645406.

 -- Nishanth Aravamudan <email address hidden> Tue, 06 Dec 2016 17:26:36 +0100