[R/load] guard against broken vml. closes #201 and #200

[JanMarvin]

skip names assignment for conditional formatting, this was broken too.

[JanMarvin]

Example file is in #201

[codecov-commenter]

Codecov Report

Merging #202 (8e8dace) into main (805a669) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 8e8dace differs from pull request most recent head a7069ef. Consider uploading reports for the commit a7069ef to get more accurate results

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
+ Coverage   82.66%   82.71%   +0.04%     
==========================================
  Files          36       36              
  Lines        7397     7399       +2     
==========================================
+ Hits         6115     6120       +5     
+ Misses       1282     1279       -3     

Impacted Files	Coverage Δ
R/utils.R	88.57% <100.00%> (+0.33%)	⬆️
R/wb_load.R	95.78% <100.00%> (+0.52%)	⬆️
R/xl_open.R	31.03% <100.00%> (+2.46%)	⬆️

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