Switch to just logging the error.

Apparently, despite defining an error type, nothing exposes it.

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

@@ -129,10 +129,7 @@ func (s *Service) Register(oldService types.Service, client *gomatrix.Client) er
 			// validate the plain text template is valid
 			_, err := text.New("textTemplate").Parse(templates.TextTemplate)
 			if err != nil {
-				log.WithFields(log.Fields{
-					"line":        err.line,
-					"description": err.description,
-				}).Warn("plain text Template Error")
+				log.WithError(err).Print("plain text Template Error")
 				return fmt.Errorf("plain text template is invalid")
 			}
 		}
@@ -140,10 +137,7 @@ func (s *Service) Register(oldService types.Service, client *gomatrix.Client) er
 			// validate that the html template is valid
 			_, err := html.New("htmlTemplate").Parse(templates.HTMLTemplate)
 			if err != nil {
-				log.WithFields(log.Fields{
-					"line":        err.line,
-					"description": err.description,
-				}).Warn("HTML Template Error")
+				log.WithError(err).Print("html Template Error")
 				return fmt.Errorf("html template is invalid")
 			}
 		}