fixed 删除用户时issue，pr用户显示已注销

app/views/api/v1/users/_simple_user.json.jbuilder

@@ -7,5 +7,5 @@ if user.present?
 else
   json.name "已注销"
   json.login ""
-  json.image_url Rails.application.config_for(:configuration)['platform_url'] + "/" + url_to_avatar(user).to_s
+  json.image_url Rails.application.config_for(:configuration)['platform_url'] + "/" + User::Avatar.get_letter_avatar_url("D")
 end

app/views/pull_requests/index.json.jbuilder

@@ -35,9 +35,9 @@ json.issues do
     json.pr_full_time pr.status == 1 ? pr.updated_at : issue.updated_on
     json.assign_user_name issue.get_assign_user.try(:show_real_name)
     json.assign_user_login issue.get_assign_user.try(:login)
-    json.author_name issue.user.try(:show_real_name)
+    json.author_name issue.user.blank?? "已注销": issue.user.show_real_name
     json.author_login issue.user.try(:login)
-    json.avatar_url url_to_avatar(issue.user)
+    json.avatar_url issue.user.blank?? User::Avatar.get_letter_avatar_url("D") : url_to_avatar(issue.user)
     json.priority issue.priority.try(:name)
     json.version issue.version.try(:name)
     json.journals_count issue.get_journals_size

app/views/pull_requests/show.json.jbuilder

@@ -44,9 +44,9 @@ json.issue do
   json.created_at format_time(@issue.created_on)
   json.assign_user_name @issue_assign_to.try(:show_real_name)
   json.assign_user_login @issue_assign_to.try(:login)
-  json.author_name @issue_user.try(:show_real_name)
+  json.author_name @issue_user.blank?? "已注销": @issue_user.show_real_name
   json.author_login @issue_user.try(:login)
-  json.author_picture url_to_avatar(@issue_user)
+  json.avatar_url @issue_user.blank?? User::Avatar.get_letter_avatar_url("D") : url_to_avatar(@issue_user)
   json.issue_status @issue.issue_status.try(:name)
   json.priority @issue.priority.try(:name)
   json.version @issue.version.try(:name)

app/views/users/_user_simple.json.jbuilder

@@ -4,6 +4,8 @@ if user.present?
   json.name user.real_name
   json.login user.login
   json.image_url url_to_avatar(user)
-else 
-  json.nil!
+else
+  json.name "已注销"
+  json.login ""
+  json.image_url Rails.application.config_for(:configuration)['platform_url'] + "/" + User::Avatar.get_letter_avatar_url("D")
 end