Remove error logging on "failed in fdb_vlanmac", it is considered normal

that the dependences of FDB_ENTRY are temporarily not available.

Author: qiluo-msft

src/sonic_ax_impl/mibs/ietf/rfc4363.py

@@ -98,9 +98,6 @@ def update_data(self):
                 continue
 
             vlanmac = self.fdb_vlanmac(fdb)
-            if not vlanmac:
-                mibs.logger.error("SyncD 'ASIC_DB' includes invalid FDB_ENTRY '{}': failed in fdb_vlanmac().".format(fdb_str))
-                continue
             self.vlanmac_ifindex_map[vlanmac] = port_index
             self.vlanmac_ifindex_list.append(vlanmac)
         self.vlanmac_ifindex_list.sort()