Updated git submodules

Project: appc master b59ab6b65a4f81464a970e579107d0828f78aadc

Fix Blocker/Critical sonar issues

Fix Blocker/Critical sonar issues in appc module
https://sonar.onap.org/issues/search#issues=AV36Pm5i89V-MRZU59OH
Fixed NullPointerException might be thrown as 'data' is nullable here

Issue-Id: APPC-186
Change-Id: I65ee1745f5fd5a7f7ac3365704943b25a9341e8a
Signed-off-by: shashikanth.vh <shashikanth.vh@huawei.com>

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index b6e1a7e..b59ab6b 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit b6e1a7e77f59259c0f0a200ebff22ad9fc7940b3
+Subproject commit b59ab6b65a4f81464a970e579107d0828f78aadc