fix p2p vxlan warmboot check failure

Author: jcaiMR

orchagent/vxlanorch.cpp

@@ -2347,6 +2347,14 @@ bool EvpnRemoteVnip2pOrch::addOperation(const Request& request)
         return true;
     }
 
+    EvpnNvoOrch* evpn_orch = gDirectory.get<EvpnNvoOrch*>();
+    auto vtep_ptr = evpn_orch->getEVPNVtep();
+    if (!vtep_ptr) {
+        SWSS_LOG_WARN("Remote VNI add: Source VTEP not found. remote=%s vid=%d",
+                      remote_vtep.c_str(), vlan_id);
+        return true;
+    }
+
     VxlanTunnelOrch* tunnel_orch = gDirectory.get<VxlanTunnelOrch*>();
     Port tunnelPort, vlanPort;