更改：项目标记不能清空

app/controllers/projects_controller.rb

@@ -132,7 +132,7 @@ class ProjectsController < ApplicationController
       # TODO:
       # 临时特殊处理修改website、lesson_url操作方法
       if project_params.has_key?("website") 
-        if params[:project_topic_names].present? && params[:project_topic_names].is_a?(Array)
+        if params[:project_topic_names].is_a?(Array)
           ProjectTopicRalate.where(project: @project).destroy_all
           params[:project_topic_names].each do |name|
             project_topic = ProjectTopic.find_or_create_by!(name: name.downcase)