fix: error on accessing nullable variables

[ryo-gk]

Fix the error which occurs when container element is null.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b3d5fb1) 80.08% compared to head (da8e9c1) 80.08%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #277   +/-   ##
=======================================
  Coverage   80.08%   80.08%           
=======================================
  Files         115      115           
  Lines        9983     9983           
  Branches      406      406           
=======================================
  Hits         7995     7995           
  Misses       1988     1988           

Impacted Files	Coverage Δ
lib/components/STableColumn.vue	76.36% <0.00%> (ø)
lib/composables/Flyout.ts	74.46% <0.00%> (ø)

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[kiaking]

Looks reasonable to me.

@brc-dd Could you take a look? 👀

[brc-dd]

LGTM, but why aren't these handled by TS in the first place? (I see that everything in the flyout composable is any.)

[kiaking]

LGTM, but why aren't these handled by TS in the first place? (I see that everything in the flyout composable is any.)

I'm pretty sure because we were too lazy 😅