削除済みメンバー名義でログインされる場合があるのを修正

[nanasess]

Fixes #929

[nanasess]

テストを書くのは難しそう。E2Eテストでログイン処理できていればOKとする

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.94%. Comparing base (a248cbd) to head (3dc604c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1106   +/-   ##
=======================================
  Coverage   50.94%   50.94%           
=======================================
  Files          80       80           
  Lines       10256    10256           
=======================================
  Hits         5225     5225           
  Misses       5031     5031           

Flag	Coverage Δ
tests	50.94% <ø> (ø)

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