[gimp] Bug 749044 - Exporting as KISS - CELL (*.cel) results in error

[Michael Schumacher <schumaml src gnome org>]

commit bf9b33ece2176ef721c9341db2c4df81da3e6017
Author: Adrian Likins <alikins redhat com>
Date:   Thu May 26 03:48:26 2016 +0200

    Bug 749044 - Exporting as KISS - CELL (*.cel) results in error

 plug-ins/common/file-cel.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/common/file-cel.c b/plug-ins/common/file-cel.c
index b0495ac..284dc9e 100644
--- a/plug-ins/common/file-cel.c
+++ b/plug-ins/common/file-cel.c
@@ -256,7 +256,10 @@ run (const gchar      *name,
       if (save_image (g_file_new_for_uri (param[3].data.d_string),
                       image_ID, drawable_ID, &error))
         {
-          gimp_set_data (SAVE_PROC, palette_file, data_length);
+         if (data_length)
+           {
+             gimp_set_data (SAVE_PROC, palette_file, data_length);
+           }
         }
       else
         {