Use main listen for nginx

tesseract/genconf/main.go

@@ -79,6 +79,11 @@ func loadConfig(yamlFile string) Config {
 		log.Fatalf("Failed to parse YAML: %v", err)
 	}
 
+	// Set default listen port if not configured
+	if len(config.Listen) == 0 {
+		config.Listen = []string{":8080"}
+	}
+
 	// Set defaults for log entries
 	for i := range config.Logs {
 		if config.Logs[i].PoolSize == 0 {