router: move ASSERT(headers.Path()) to avoid segfault (#3328)
router: move ASSERT(headers.Path()) to avoid segfault (#3328)

Signed-off-by: Nicholas Johns <52e33f912f26cb246476f128bae7442a12894b46@gmail.com>

eklitzke/envoy,lyft/envoy,eklitzke/envoy,jrajahalme/envoy,envoyproxy/envoy,jrajahalme/envoy,jrajahalme/envoy,lizan/envoy,envoyproxy/envoy-wasm,sebrandon1/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,istio/envoy,lyft/envoy,istio/envoy,envoyproxy/envoy,sebrandon1/envoy,dnoe/envoy,envoyproxy/envoy,envoyproxy/envoy,sebrandon1/envoy,jrajahalme/envoy,envoyproxy/envoy,sebrandon1/envoy,lizan/envoy,envoyproxy/envoy,lyft/envoy,istio/envoy,envoyproxy/envoy,lizan/envoy,sebrandon1/envoy,eklitzke/envoy,lizan/envoy,envoyproxy/envoy-wasm,istio/envoy,eklitzke/envoy,eklitzke/envoy,lyft/envoy,dnoe/envoy,envoyproxy/envoy,dnoe/envoy,envoyproxy/envoy,istio/envoy,dnoe/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy,istio/envoy,lizan/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,dnoe/envoy,jrajahalme/envoy,jrajahalme/envoy,envoyproxy/envoy,eklitzke/envoy,lizan/envoy,envoyproxy/envoy-wasm,lyft/envoy