Dropdown box errors on Databind when no records are returned

I have a drop down box that causes the following error when I bind it to a datasource that returns no records.

'ddJob' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

What's the work-around here?

Here's my code - it bombs on the last line:
            // Fill DropDownList with Jobs and add All as a selection option
            SHATutil shat = new SHATutil();
            ddJob.DataSource = shat.GetUserJobs(Profile.UserName);
            ddJob.DataTextField = "JobName";
            ddJob.DataValueField = "JobName";
            ddJob.DataBind();