.docx export uses different style for empty table cells

[ethankale]

Table cells with non-empty characters (other than space) in them use the "compact" style in the generated .docx; empty cells (with just spaces) use the "normal" style. This can cause issues with formatting tables with a mix of empty & filled cells.

See the following table:

|Parameter |Units |Matrix |Fraction |Method | Count|
|Dissolved Oxygen-Saturation |% |Water | |MULTIMETER | 37|
|Total Suspended Solids |mg/L |Water |Suspended |SM2540D | 40|

The .md table above was generated by RStudio 0.98.932, using knitr.