Part 2 uses "empty cell" and "cell is empty" - normalize on "empty cell"

6.3.5 Conversion to Number: (last bullet item, end of paragraph) - "An empty cell returns the value 0. Note: Evaluators may choose to convert references to Text in a different manner than they handle converting embedded Text to a Number." [Do we really need this note?] 6.3.14 Conversion to Text (last bullet item): "Reference, convert cell value to Number. Empty cell returns the value 0. After conversion or empty cell value return, perform conversion for Number, 6.3.14." 6.3.15 Conversion to DateParam (last bullet item): "Reference, convert cell value to Number. Empty cell returns the value 0. After conversion or empty cell value return, perform conversion for Number, 6.3.15." 6.3.16 Conversion to TimeParam (last bullet item): "Reference, convert cell value to Number. Empty cell returns the value 0. After conversion or empty cell value return, perform conversion for Number, 6.3.16." [This happens in 6.13.8 COUNTBLANK and 6.13.14 ISBLANK but they are too intertwined to fix separately (and they have other issues. I will open a separate JIRA issue on them.] [I put in "Number" because the sections in question don't say scalar, they say Number.]