Fix T67078: Crash with vertex slide and multi-objects

If one of the objects had invalid selected edges, it would lead to a
crash since none of the for loops were checking for whether the edge
slide data is valid.

We could refactor the macros to create a new
FOREACH_TRANS_DATA_CONTAINER_WITH_DATA

However we are too close to 2.80 final release so we manually skip them
for now.

Note: TRANS_DATA_CONTAINER_FIRST_OK cannot be used either for the same
reason.

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D5274

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/transform/transform_conversions.c b/source/blender/editors/transform/transform_conversions.c
index f7158244cc7..d13c0f8e8f1 100644
--- a/source/blender/editors/transform/transform_conversions.c
+++ b/source/blender/editors/transform/transform_conversions.c
@@ -7100,6 +7100,10 @@ void special_aftertrans_update(bContext *C, TransInfo *t)
           FOREACH_TRANS_DATA_CONTAINER (t, tc) {
             EdgeSlideData *sld = tc->custom.mode.data;
 
+            if (sld == NULL) {
+              continue;
+            }
+
             /* Free temporary faces to avoid auto-merging and deleting
              * during cleanup - psy-fi. */
             freeEdgeSlideTempFaces(sld);