Fix Error on Missing interface

Missing interface != 500 error, just means less data
we can show.

Tested: No 500 error on systems with missing interface

Change-Id: Ifaecd67f8f4f6faed26c7a24ab79dfbd82462291
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/redfish-core/lib/systems.hpp b/redfish-core/lib/systems.hpp
index 6da9fc6..c092379 100644
--- a/redfish-core/lib/systems.hpp
+++ b/redfish-core/lib/systems.hpp
@@ -886,7 +886,7 @@
             if (ec)
             {
                 BMCWEB_LOG_DEBUG << "DBUS response error " << ec;
-                messages::internalError(aResp->res);
+                // not an error, don't have to have the interface
                 return;
             }