Fix issue with blank target escapement & comment
Fix issue with blank target escapement & comment

If the target escapement is blank, then use zero.  This is because FRAM
app does not allow NULL escapement targets.

also, fix "NA" comment when converting NA R values to text.  If R has NA
value, then use blank string

PSC-CoTC/PSC-FRAM-Admin,PSC-CoTC/PSC-FRAM-Admin