wddx syntax?

[alsjka]

Hello, I am retrieving my scheduled tasks and get an error if one of the tasks do not contain say for example end_time. What would be the sytnax to skip outputing the struct if the value is not there.

<cfobject type="JAVA" action="Create" name="factory" class="coldfusion.server.ServiceFactory">

<cfset allTasks = factory.CronService.listAll()>

<cfset numberOtasks = arraylen(allTasks)>

<cfloop index="i" from="1" to="#numberOtasks#">
<cfoutput>
Task Name = #allTasks.task#<br>
URL = #allTasks.url#<br>
Interval = #allTasks.interval#<br>
Start_Date = #allTasks.start_date#<br>
Start_Time = #allTasks.start_time#<br>
Path = #allTasks.path#<br>
File = #allTasks.file#<br>
resolveurl = #allTasks.resolveurl#<br>
publish = #allTasks.publish#<br>
pswd = #allTasks.password#<br>
pswd = #allTasks.operation#<br>
username = #allTasks.username#<br>
http_port = #allTasks.http_port#<br>
http_proxy_port = #allTasks.http_proxy_port#<br>
proxy_server = #allTasks.proxy_server#<br>
disabled = #allTasks.disabled#<br>
request_time_out = #allTasks.request_time_out#<br>

<!--- Need to skip here --->

<cfif isdefined("value.end_time")> <!---Improper syntax--->
end_time = #allTasks.end_time#<br>
</cfif>

</cfoutput><br>
<hr>
</cfloop>