[proxy] Fix proxy nil check
[proxy] Fix proxy nil check

Signed-off-by: chaosbox <722816871b695bc868eb9ca32ac86c0c3a135755@bskyb.com>

michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium