Add len check to example. Closes #51.

README.md

@@ -31,37 +31,39 @@ documentation and examples.
 package main
 
 import (
-    "fmt"
-    "github.com/oschwald/geoip2-golang"
-    "log"
-    "net"
+	"fmt"
+	"github.com/oschwald/geoip2-golang"
+	"log"
+	"net"
 )
 
 func main() {
-    db, err := geoip2.Open("GeoIP2-City.mmdb")
-    if err != nil {
-            log.Fatal(err)
-    }
-    defer db.Close()
-    // If you are using strings that may be invalid, check that ip is not nil
-    ip := net.ParseIP("81.2.69.142")
-    record, err := db.City(ip)
-    if err != nil {
-            log.Fatal(err)
-    }
-    fmt.Printf("Portuguese (BR) city name: %v\n", record.City.Names["pt-BR"])
-    fmt.Printf("English subdivision name: %v\n", record.Subdivisions[0].Names["en"])
-    fmt.Printf("Russian country name: %v\n", record.Country.Names["ru"])
-    fmt.Printf("ISO country code: %v\n", record.Country.IsoCode)
-    fmt.Printf("Time zone: %v\n", record.Location.TimeZone)
-    fmt.Printf("Coordinates: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
-    // Output:
-    // Portuguese (BR) city name: Londres
-    // English subdivision name: England
-    // Russian country name: Великобритания
-    // ISO country code: GB
-    // Time zone: Europe/London
-    // Coordinates: 51.5142, -0.0931
+	db, err := geoip2.Open("GeoIP2-City.mmdb")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+	// If you are using strings that may be invalid, check that ip is not nil
+	ip := net.ParseIP("81.2.69.142")
+	record, err := db.City(ip)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Portuguese (BR) city name: %v\n", record.City.Names["pt-BR"])
+	if len(record.Subdivisions) > 0 {
+		fmt.Printf("English subdivision name: %v\n", record.Subdivisions[0].Names["en"])
+	}
+	fmt.Printf("Russian country name: %v\n", record.Country.Names["ru"])
+	fmt.Printf("ISO country code: %v\n", record.Country.IsoCode)
+	fmt.Printf("Time zone: %v\n", record.Location.TimeZone)
+	fmt.Printf("Coordinates: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
+	// Output:
+	// Portuguese (BR) city name: Londres
+	// English subdivision name: England
+	// Russian country name: Великобритания
+	// ISO country code: GB
+	// Time zone: Europe/London
+	// Coordinates: 51.5142, -0.0931
 }
 ```