Two empty rows remain in monthly calendar on most months

[narrowstacks]

When the program generates the table in the word document for monthly calendars, it is not aware of how many rows it actually needs, so we currently use the max that would ever be used. As a result, if a month doesn't take up all 13 rows, the program doesn't remove the empty rows at the bottom.
If the true number of rows needed could be calculated before the table is created, this would fix it.

In the image below, the errant rows at the bottom are highlighted in grey: