Fix more empty return values

[dolanmiu]

No description provided.

[codecov-commenter]

Codecov Report

Base: 99.82% // Head: 99.82% // No change to project coverage 👍

Coverage data is based on head (7f88a38) compared to base (a481518).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1866   +/-   ##
=======================================
  Coverage   99.82%   99.82%           
=======================================
  Files         320      320           
  Lines        4009     4009           
  Branches      559      559           
=======================================
  Hits         4002     4002           
  Misses          7        7           

Impacted Files	Coverage Δ
...body/section-properties/properties/page-borders.ts	100.00% <100.00%> (ø)
src/file/paragraph/run/symbol-run.ts	100.00% <100.00%> (ø)

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