Using excel formulas to circumvent non-existence of data

Hello,

If there is no data in my database for a particular month my query retrieves nothing. Accordingly I would like to insert an excel formula in the spread sheet saying something like "If cell is blank then insert next month name"

Is there a way of excel knowing what the next month name is (for example: what comes after APRIL)? Can I create a list of values in excel to tell it what month comes next?

Example:

APRIL - $100

MAY - $100

NOVEMBER - $100

I would like to insert all the months between May and November

Thanks in advance.