Avoid nullptr in enableFanvyLogger (#21448)
Avoid nullptr in enableFanvyLogger (#21448)

Signed-off-by: Boteng Yao <1e07b3d456bba9f9ad0af2f90e34cabe30afa831@google.com>
envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy