Bug#850027: libfreeimage3: freeimage 3.17.0+ds1-4 makes rviz unusable

[Ghislain Vaillant]

Hi Erik, thanks for reporting this issue,

freeimage/3.17.0+ds1-4 fixed an issue with the patch used to remove the
vendored dependencies and use the system one instead. See #841089 [1].

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=841089

The updated patch introduces a null-node for plugins which have been
disabled (here the G3 fax format). Before this patch, all nodes stored
in the plugin map were guaranteed to be non-null but all plugins with
IDs over FIF_FAXG3 were wrongly indexed.

A fix for your issue in rviz would be to filter the plugin map from
non-null nodes prior to registering the codecs.

Hope this helps,
Ghis