[MM-60083] export: do not export DMs/GMs if users are deleted (#28854)

server/channels/app/import_functions.go

@@ -2327,12 +2327,15 @@ func (a *App) importMultipleDirectPostLines(rctx request.CTX, lines []imports.Li
 				return line.LineNumber, model.NewAppError("BulkImport", "app.import.import_direct_post.create_direct_channel.error", nil, "", http.StatusBadRequest).Wrap(err)
 			}
 			channel = ch
-		} else {
+		} else if len(userIDs) > 2 {
 			ch, err = a.createGroupChannel(rctx, userIDs)
 			if err != nil && err.Id != store.ChannelExistsError {
 				return line.LineNumber, model.NewAppError("BulkImport", "app.import.import_direct_post.create_group_channel.error", nil, "", http.StatusBadRequest).Wrap(err)
 			}
 			channel = ch
+		} else {
+			rctx.Logger().Warn("Not enough users to create a direct channel", mlog.Int("line_number", line.LineNumber))
+			continue
 		}
 
 		user := users[strings.ToLower(*line.DirectPost.User)]