include nil check in wrapper in indexer_servicer.go

Signed-off-by: Alexander zur Bonsen <alexander.zur.bonsen@tngtech.com>

orc8r/cloud/go/services/orchestrator/servicers/protected/indexer_servicer.go

@@ -120,21 +120,15 @@ func setSecondaryStates(ctx context.Context, networkID string, states state_type
 	errs := &multierror.Error{}
 	if len(sessionIDToIMSI) != 0 {
 		err := directoryd.MapSessionIDsToIMSIs(ctx, networkID, sessionIDToIMSI)
-		if err != nil {
-			errs = multierror.Append(errs, fmt.Errorf("failed to update directoryd mapping of session IDs to IMSIs %+v %v", sessionIDToIMSI, err))
-		}
+		errs = errsAppend(errs, "failed to update directoryd mapping of session IDs to IMSIs %+v %v", sessionIDToIMSI, err)
 	}
 	if len(cTeidToHwId) != 0 {
 		err := directoryd.MapSgwCTeidToHWID(ctx, networkID, cTeidToHwId)
-		if err != nil {
-			errs = multierror.Append(errs, fmt.Errorf("failed to update directoryd mapping of control plane teid To HwID %+v %v", sessionIDToIMSI, err))
-		}
+		errs = errsAppend(errs, "failed to update directoryd mapping of control plane teid To HwID %+v %v", sessionIDToIMSI, err)
 	}
 	if len(uTeidToHwId) != 0 {
 		err := directoryd.MapSgwUTeidToHWID(ctx, networkID, uTeidToHwId)
-		if err != nil {
-			errs = multierror.Append(errs, fmt.Errorf("failed to update directoryd mapping of user plane teid To HwID %+v %v", sessionIDToIMSI, err))
-		}
+		errs = errsAppend(errs, "failed to update directoryd mapping of user plane teid To HwID %+v %v", sessionIDToIMSI, err)
 	}
 
 	// errs will only be nil if both updates succeeded
@@ -282,3 +276,11 @@ func getTeidToHwIdPair(tType teidType, record *directoryd_types.DirectoryRecord)
 	}
 	return teids, hwid, err
 }
+
+// errsAppend concatenates message, sessionIDToIMSI and err into a new error message and appends to errs
+func errsAppend(errs *multierror.Error, message string, sessionIDToIMSI map[string]string, err error) *multierror.Error {
+	if err != nil {
+		errs = multierror.Append(errs, fmt.Errorf(message, sessionIDToIMSI, err))
+	}
+	return errs
+}