I use a different method of recording this information. If my sources say someone never married, then I will enter "d. unm." (died unmarried) in the death description field. Similarly, if my sources mention various other facts such as someone not having children, I will use the commonly used shorthand from the English noble/royal linage books, i.e. "d.s.p." (Latin, decessit sine prole -- died without issue)
A list of these abbreviations can be found here...http://freepages.genealogy.rootsweb.ancestry.com/~randyj2222...
Another method that I sometimes use for couples who a source says had a specific number of children is a shared fact called "Children". For example, if the 1900 Census says 9 children, 7 living, I will create an instance of the Children fact for that couple with the date as 1900 and the description as some variation of "9 ch., 7 living".
If my sources said the couple had no children, I would enter "No issue" in the description field of the Children fact. Having this method in addition to the other method above is especially useful for situations where a specific couple are noted as not having any children together, but either or both people had (or might have had) children by another spouse.