ci: avoid testing pdf when failure

[davidgohel]

test

[codecov-commenter]

Codecov Report

Base: 48.44% // Head: 47.42% // Decreases project coverage by -1.02% ⚠️

Coverage data is based on head (6404d37) compared to base (1cf9557).
Patch coverage: 20.68% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #460      +/-   ##
==========================================
- Coverage   48.44%   47.42%   -1.03%     
==========================================
  Files          46       46              
  Lines        7189     7215      +26     
==========================================
- Hits         3483     3422      -61     
- Misses       3706     3793      +87     

Impacted Files	Coverage Δ
R/styles.R	66.55% <0.00%> (ø)
R/read_structure.R	87.50% <4.34%> (-11.88%)	⬇️
R/captions.R	63.07% <100.00%> (+6.26%)	⬆️
R/printers.R	39.87% <100.00%> (-11.40%)	⬇️
R/latex_str.R	71.78% <0.00%> (-15.90%)	⬇️
R/runs_as_functions.R	83.19% <0.00%> (-0.82%)	⬇️
R/html_str.R	79.46% <0.00%> (+0.38%)	⬆️
R/flextable.R	68.67% <0.00%> (+7.22%)	⬆️
... and 1 more

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