print error and include in txt log on crash; fix email migration

exit.go

@@ -50,6 +50,10 @@ func Exit(err interface{}) {
 		log.Fatalf("Failed to load template: %v", err)
 	}
 	logCache := lineCache.String()
+	if err != nil {
+		fmt.Println(err)
+		logCache += "\n" + fmt.Sprint(err)
+	}
 	logCache += "\n" + string(debug.Stack())
 	sanitized := sanitizeLog(logCache)
 	data := map[string]interface{}{

migrations.go

@@ -90,10 +90,26 @@ func migrateEmailStorage(app *appContext) error {
 	}
 	newEmails := map[string]EmailAddress{}
 	for jfID, addr := range emails {
+		switch addr.(type) {
+		case string:
 			newEmails[jfID] = EmailAddress{
 				Addr:    addr.(string),
 				Contact: true,
 			}
+		// In case email settings still persist after migration has already happened
+		case map[string]interface{}:
+			return nil
+		default:
+			return fmt.Errorf("Email address was type %T, not string: \"%+v\"\n", addr, addr)
+		}
+	}
+	config, err := ini.Load(app.configPath)
+	if err != nil {
+		return err
+	}
+	config.Section("email").Key("use_24h").SetValue("")
+	if err := config.SaveTo(app.configPath); err != nil {
+		return err
 	}
 	err = storeJSON(app.storage.emails_path+".bak", emails)
 	if err != nil {