fix sql.trx_view and MaskingColumns column_comment

[GloomyNAN]

修复：实例管理-会话管理-事务信息报错

[codecov]

Codecov Report

Merging #1175 (07354b2) into master (ea48891) will not change coverage.
The diff coverage is n/a.

❗ Current head 07354b2 differs from pull request most recent head 36b5677. Consider uploading reports for the commit 36b5677 to get more accurate results

@@           Coverage Diff           @@
##           master    #1175   +/-   ##
=======================================
  Coverage   77.91%   77.91%           
=======================================
  Files          76       76           
  Lines       11941    11941           
=======================================
  Hits         9304     9304           
  Misses       2637     2637           

Impacted Files	Coverage Δ
sql/admin.py	92.30% <ø> (ø)
sql/db_diagnostic.py	16.27% <ø> (ø)

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