[libdazzle] dockbin: check for neighbors before querying

[Christian Hergert <chergert src gnome org>]

commit 3d621058d763f5635dcc2107680013b1a8bf34f1
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 7 10:45:33 2017 -0700

    dockbin: check for neighbors before querying
    
    We had additional protections at one point, but this is more clear now
    that we already have a conditional.

 src/panel/dzl-dock-bin.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/panel/dzl-dock-bin.c b/src/panel/dzl-dock-bin.c
index e1b47c7..1e771a4 100644
--- a/src/panel/dzl-dock-bin.c
+++ b/src/panel/dzl-dock-bin.c
@@ -851,7 +851,7 @@ dzl_dock_bin_child_size_allocate (DzlDockBin      *self,
                                                  &child->min_req.width,
                                                  &child->nat_req.width);
 
-      if (child->pinned)
+      if (child->pinned && n_children > 1)
         {
           dzl_dock_bin_get_children_preferred_height (self,
                                                       &children [1],