Updated import data controller to check for blank user_id

app/controllers/admin/import_data_controller.rb

@@ -50,6 +50,8 @@ class Admin::ImportDataController < OrbitBackendController
            @teacher.user_id = hash['teacher_en']
           elsif hash['teacher_en'].blank?
             @teacher.user_id = hash['teacher_zh_tw']
+          else 
+            @teacher.user_id = "Please Enter a User Name"
           end
           @teacher.save!
       end