refactor: minor styling fixes; deadcode cleanup and correct log level

internal/notif/base.go

@@ -2,6 +2,7 @@ package notif
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"net/http"
 	"net/url"
@@ -49,7 +50,7 @@ func (base *ProviderBase) Validate() error {
 	}
 	u, err := url.Parse(base.URL)
 	if err != nil {
-		return err
+		return fmt.Errorf("invalid url: %w", err)
 	}
 	base.URL = u.String()
 	return nil

internal/notif/webhook.go

@@ -44,14 +44,13 @@ func (webhook *Webhook) Validate() error {
 
 	switch webhook.Template {
 	case "":
-		if webhook.MIMEType == MimeTypeJSON {
+		if webhook.Payload == "" {
+			errs.Adds("invalid payload, expect non-empty")
+		} else if webhook.MIMEType == MimeTypeJSON {
 			if !validateJSONPayload(webhook.Payload) {
 				errs.Adds("invalid payload, expect valid JSON")
 			}
 		}
-		if webhook.Payload == "" {
-			errs.Adds("invalid payload, expect non-empty")
-		}
 	case "discord":
 		webhook.ColorMode = "dec"
 		webhook.Method = http.MethodPost