Mask #Error In Query

I have a query and it works fine, it gives the progress of tasks related to the whole project.
The thing is that if the whole project is at 0% and you can't divide by 0 the query returns the value #Error.
Is there a way to mask it so that rather then returning #Error it shows up a blank filed or at least 0.

For example it is like this now
OutlineNumber |OutlineDescription |DeliverableDesc| Contribution
6.1| UST OTR Model V2| OTR Model v2| 100.00%
6.1.2| QA & Bug Fixing| OTR Model v2| 0.00%
7.1| STP | STP | #Error


And would like it to be this
OutlineNumber| OutlineDescription| DeliverableDesc| Contribution
6.1| UST OTR Model V2| OTR Model v2| 100.00%
6.1.2| QA & Bug Fixing| OTR Model v2| 0.00%
7.1| STP | STP |
//notice no #Error just blank space

Here is the query
Code:SELECT RawData.OutlineNumber, RawData.OutlineDescription, RawData.DeliverableDesc, FormatPercent(RawData.PercentComplete/subQuery.TotalProgress) AS ContributionFROM RawData, [SELECT DeliverableDesc, SUM(PercentComplete) AS TotalProgress FROM RawData GROUP BY DeliverableDesc]. AS subQueryWHERE ((RawData.DeliverableDesc)=(subQuery.DeliverableDe sc));

thanks for any help you might be able to give

Note I am presenting this query in a form to the user, so if it can't be done in query directly, is there a way I can code it on the form to remove the #Error values in teh query