data_tabulate() for crosstables prints NA-proportions when no values are available

[strengejacke]

Fixes #492

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.73%. Comparing base (26ca506) to head (1a3b44b).
Report is 1 commits behind head on main.

❗ Current head 1a3b44b differs from pull request most recent head eef26db. Consider uploading reports for the commit eef26db to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #493      +/-   ##
==========================================
+ Coverage   90.66%   90.73%   +0.07%     
==========================================
  Files          74       75       +1     
  Lines        5765     5809      +44     
==========================================
+ Hits         5227     5271      +44     
  Misses        538      538              

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[etiennebacher]

Thanks!