Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 4e944d4149bfcf7196691c57f3ae6659ffd05960
  - Merge "Added null check for execute() result to remove static analyzer warning"
  - Added null check for execute() result to remove
    static analyzer warning

    Issue-ID: SO-1841
    Signed-off-by: Oleksandr Moliavko <o.moliavko@samsung.com>
    Change-Id: Ifc8481b659c5b53378611f9e80db087db590ae05

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index d4c2f44..4e944d4 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit d4c2f4467d3981f3856f328e747ec92023ef298a
+Subproject commit 4e944d4149bfcf7196691c57f3ae6659ffd05960