Error handling an empty structure

I have a web app that queries a database and returns the results in XML. I used SOXML - XML2CF to convert the XML to a CF Structure. Everything works great if there are hits and the XML contains results. If there are no results, the app fails. What I need is to check the structure for the existance of data before trying to display the results.

Here's what I have...

<cf_soxml action="XML2CF" input="#CFHTTP.FileContent#" output="jobPostings">
<cfset availJobs = jobPostings.root["Job"]>

If there are no results to display, I get this...

The object JOB is not present in the scope named JOBPOSTINGS.ROOT.

Anyone know how I can search the structure for the existance of ROOT.JOB so I can display a message if there are no results?

Thanks,
Joe