fixed：操作日志为空的情况

app/models/journal.rb

@@ -532,6 +532,7 @@ class Journal < ApplicationRecord
   def operate_content 
     content = "#{operate_by_content}"
     detail = self.journal_details.take
+    content = ""
     case detail.property
     when 'issue'
       content += "创建了<b>疑修</b>"
@@ -605,7 +606,7 @@ class Journal < ApplicationRecord
         content += "由<b>#{old_value}</b>更改为<b>#{new_value}</b>"
       end
     end
-    
+    content = self.pm_operate_content if content == ""
   end
 
   def journal_content