Enable readability-container-size-empty tests

This one is a little trivial, but it does help in readability.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I5366d4eec8af2f781b3bad804131ae2eb806e3aa
diff --git a/redfish-core/lib/account_service.hpp b/redfish-core/lib/account_service.hpp
index 53d644d..0bf03cc 100644
--- a/redfish-core/lib/account_service.hpp
+++ b/redfish-core/lib/account_service.hpp
@@ -88,7 +88,7 @@
     {
         return "Operator";
     }
-    if ((role == "") || (role == "priv-noaccess"))
+    if (role.empty() || (role == "priv-noaccess"))
     {
         return "NoAccess";
     }
@@ -108,7 +108,7 @@
     {
         return "priv-operator";
     }
-    if ((role == "NoAccess") || (role == ""))
+    if ((role == "NoAccess") || (role.empty()))
     {
         return "priv-noaccess";
     }
@@ -1029,7 +1029,7 @@
     }
     if (serviceAddressList)
     {
-        if ((*serviceAddressList).size() == 0)
+        if (serviceAddressList->empty())
         {
             messages::propertyValueNotInList(asyncResp->res, "[]",
                                              "ServiceAddress");
@@ -1038,7 +1038,7 @@
     }
     if (baseDNList)
     {
-        if ((*baseDNList).size() == 0)
+        if (baseDNList->empty())
         {
             messages::propertyValueNotInList(asyncResp->res, "[]",
                                              "BaseDistinguishedNames");