'NameError: name 'arch' is not defined' when open "view register" in ida plugin

**Describe the bug**
'NameError: name 'arch' is not defined' when open "view register" in ida plugin


**Expected behavior**
View Register window appear

**Screenshots**
![image](https://user-images.githubusercontent.com/13744511/224486165-282ed5d4-33a3-4a30-9dda-a1f39a95c665.png)


**Additional context**
None
