Ok guys - rookie move on my part.
Using the conditional "IsDefined" works perfectly in stopping the XML from
parsing when no news results are returned. Here's the complete working code:
<cfoutput>
<form action="#script_name#" method="post">
<input type="text" name="search_term" size="30" /> <input type="submit"
value="Display Yahoo News Articles" />
</form><br />
<br />
</cfoutput>
<cfparam name="RSS_URL" default="">
<cfparam name="search_term" default="">
<cfif search_term neq "">
<cfset search_term = #Replace(search_term, " ", "+", "All")#>
</cfif>
<cfif search_term neq "">
<cfset RSS_URL =
"http://news.search.yahoo.com/news/rss?p=#search_term#&ei=UTF-8&fl=0&x=wrt";>
<cfhttp throwonerror="yes" url="#rss_url#" method="get"
timeout="10"></cfhttp>
<!--- <cfoutput>#cfhttp.filecontent#</cfoutput> --->
<cfif cfhttp.filecontent does not contain "gif false">
<cfset xmlDoc = XMLParse(cfhttp.filecontent)>
<!--- <cfdump var="#xmldoc#"> --->
<cfif IsDefined("xmlDoc.RSS.CHANNEL.ITEM")>
<cfoutput>
#xmlDoc.rss.channel.title.xmlText#<br>
<a
href="#xmlDoc.rss.channel.link.xmlText#">#xmlDoc.rss.channel.link.xmlText#</a><br>
#xmlDoc.rss.channel.lastBuildDate.xmlText#<br>
<hr>
<cfloop from="1" to="#ArrayLen(xmlDoc.rss.channel.item)#"
index="i">
<p>
<a
href="#xmlDoc.rss.channel.item[i].link.xmlText#">#xmlDoc.rss.channel.item[i].title.xmlText#</a><br
/>
#xmlDoc.rss.channel.item[i].description.xmlText#<br />
</p>
</cfloop>
</cfoutput>
<cfelse>
<cfoutput>
No current news stories matched your search criteria
"<strong>#search_term#</strong>".
</cfoutput>
</cfif>
</cfif>
</cfif>
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