Outdent block as said by go lint/vet

src/github.com/matrix-org/go-neb/services/alertmanager/alertmanager.go

@@ -126,12 +126,11 @@ func (s *Service) Register(oldService types.Service, client *gomatrix.Client) er
 		// validate that we have at least a plain text template
 		if templates.TextTemplate == "" {
 			return fmt.Errorf("plain text template missing")
-		} else {
-			// validate the plain text template is valid
-			_, err := text.New("textTemplate").Parse(templates.TextTemplate)
-			if err != nil {
-				return fmt.Errorf("plain text template is invalid")
-			}
+		}
+		// validate the plain text template is valid
+		_, err := text.New("textTemplate").Parse(templates.TextTemplate)
+		if err != nil {
+			return fmt.Errorf("plain text template is invalid")
 		}
 		if templates.HTMLTemplate != "" {
 			// validate that the html template is valid