Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 3b7a7443e320d6dcf9a034b0ca290598316d8821
  - Merge "Added null check for return value of getUpdateResInputObj(), to prevent crash at call of toString() method"
  - Added null check for return value of
    getUpdateResInputObj(), to prevent crash at call
    of toString() method

    Issue-ID: SO-1841
    Signed-off-by: Oleksandr Moliavko <o.moliavko@samsung.com>
    Change-Id: Ifa6c683885490fef7fcf08e2b32b2dc76ef776a6

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 503d659..3b7a744 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 503d659ff3285bc1d07c563441c63c487f4f12e3
+Subproject commit 3b7a7443e320d6dcf9a034b0ca290598316d8821