Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to cabd51660c3c8ec52e329027179f5c6cabb03aca
  - Added check for null response to prevent crash at
    response.getEntity() method call.
    
    Issue-ID: SO-1841
    Signed-off-by: Oleksandr Moliavko <o.moliavko@samsung.com>
    Change-Id: Id796f4426f33cf419bbe5ed07500452ac0c7c775
    
1 file changed