Add nil checks to envoy for compose_chart

Fix panics while exporting namespace with invalid compose chart

pkg/envoy/builder.go

@@ -131,6 +131,9 @@ func (b *builder) buildGraph(rr []resource.Interface) *graph {
 
 		// Attempt to connect all available nodes
 		for _, ref := range refs {
+			if ref == nil {
+				continue
+			}
 			// Handle wildcard references
 			if ref.IsWildcard() {
 				nn := nIndex.GetResourceType(ref.ResourceType)

pkg/envoy/resource/compose_chart.go

@@ -31,7 +31,10 @@ func NewComposeChart(res *types.Chart, nsRef *Ref, mmRef RefSet) *ComposeChart {
 
 	r.RefNs = r.addRef(nsRef)
 	for i, mRef := range mmRef {
-		r.RefMods[i] = r.addRef(mRef).Constraint(r.RefNs)
+		ref := r.addRef(mRef)
+		if ref != nil {
+			r.RefMods[i] = ref.Constraint(r.RefNs)
+		}
 	}
 
 	// Initial timestamps

pkg/envoy/yaml/compose_chart_marshal.go

@@ -38,6 +38,9 @@ func (n *composeChart) Prepare(ctx context.Context, state *envoy.ResourceState)
 
 	for i, r := range chr.Res.Config.Reports {
 		refMod := chr.RefMods[i]
+		if refMod == nil {
+			continue
+		}
 		relMod := resource.FindComposeModule(state.ParentResources, refMod.Identifiers)
 		if relMod == nil {
 			return resource.ComposeModuleErrUnresolved(refMod.Identifiers)