Backport of fix panic in injectSANMatcher when tlsContext is nil into release/1.15.x#17189

hc-github-team-consul-core merged 1 commit intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

backport/fix-xds-panic/vaguely-living-quetzalhashicorp/consul:backport/fix-xds-panic/vaguely-living-quetzalCopy head branch name to clipboard