op-e2e: Avoid panics on conductor startup failure (#10247)

op-e2e/sequencer_failover_setup.go

@@ -147,7 +147,9 @@ func setupHAInfra(t *testing.T, ctx context.Context) (*System, map[string]*condu
 			}
 
 			for _, c := range conductors {
-				if serr := c.service.Stop(ctx); serr != nil {
+				if c == nil || c.service == nil {
+					// pass. Sometimes we can get nil in this map
+				} else if serr := c.service.Stop(ctx); serr != nil {
 					t.Log("Failed to stop conductor", "error", serr)
 				}
 			}