Commit: 3ee2ed3049b9860c03084876bd96641b2f1cf5f4
Author: Sergey Sharybin
Date:   Mon Jan 8 14:10:50 2018 +0100
Branches: master
https://developer.blender.org/rB3ee2ed3049b9860c03084876bd96641b2f1cf5f4

Fix T53612: Blender crashes on CleanTracks with 'DELETE_SEGMENTS' and a 
disabled marker

Simple fix, which is totally safe for 2.79a!

===================================================================

M       source/blender/editors/space_clip/tracking_ops.c

===================================================================

diff --git a/source/blender/editors/space_clip/tracking_ops.c 
b/source/blender/editors/space_clip/tracking_ops.c
index db891dba294..2ec4f96931f 100644
--- a/source/blender/editors/space_clip/tracking_ops.c
+++ b/source/blender/editors/space_clip/tracking_ops.c
@@ -1858,6 +1858,10 @@ static bool is_track_clean(MovieTrackingTrack *track, 
int frames, int del)
                }
        }
 
+       if (count == 0) {
+               ok = 0;
+       }
+
        if (del) {
                MEM_freeN(track->markers);

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