fixes for undefineds and material-table

[mandolyte]

This change is 

[codecov]

Codecov Report

Merging #72 (afe427d) into master (2566644) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #72   +/-   ##
=======================================
  Coverage   45.95%   45.95%           
=======================================
  Files          21       21           
  Lines        2681     2681           
  Branches      848      848           
=======================================
  Hits         1232     1232           
  Misses        915      915           
  Partials      534      534           

Impacted Files	Coverage Δ
src/core/orig-quote-check.js	63.26% <100.00%> (ø)
src/core/tn-table-row-check.js	71.91% <100.00%> (ø)
src/core/tn-table-text-check.js	64.34% <100.00%> (ø)

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