Forms :: Value Missing When No Records Exist That Meet Filter Criteria

I have a main form with 3 subforms. Each subform is identical except for the value of the filter property. The filter is for the same field, but with a different value for each subform. So, for example, the first subform has a filter of:

Code:
[WBS Element]="DEF" And [Period]=Forms!frm_ProjectFinancials!Period

while the second subform has a filter of:

Code:
[WBS Element]="PPE" And [Period]=Forms!frm_ProjectFinancials!Period

and the third subform has a filter of:

Code:
[WBS Element]="EXP" And [Period]=Forms!frm_ProjectFinancials!Period

The recordset for each subform results in a single record with numeric values in each field or no records at all. When the resulting recordset is empty (no records), the bound text fields on the subform display as blank. I want these fields to display 0 instead of blank so I can use them in other calculated fields. Functions such as Nz or IsNumeric do not work since there are no records and the values are neither null nor numeric.

How I can display zeroes in the bound fields when no records exist that meet the filter criteria? Or is there a way that I can dummy a resulting recordset to have all zero values when there would otherwise be no records?