Don't display a table when no entry is present.

[tobiasraabe]

• Don't display a table if no row was added.
• Remove unnecessary if-clause.

[codecov]

Codecov Report

Merging #189 (94c6a25) into main (3428f00) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   92.80%   92.81%           
=======================================
  Files          71       71           
  Lines        6714     6718    +4     
=======================================
+ Hits         6231     6235    +4     
  Misses        483      483           

Flag	Coverage Δ
end_to_end	79.04% <83.33%> (-0.02%)	⬇️
integration	42.08% <0.00%> (-0.03%)	⬇️
unit	68.91% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
src/_pytask/live.py	99.37% <100.00%> (+<0.01%)	⬆️
tests/test_live.py	100.00% <100.00%> (ø)

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