You Seems to be using incorrect module of ciscoworks to do this. You are using NetConfig.
Netconfig is one of the Configuration Management applications, and it allows you to change the configuration of network devices, provided the configurations are archived. Netconfig automatically updates the archive when it changes the configuration. When you use it it will try to execute the commands to configure on device and would not be interested in collecting the output.
For show commands you should use the NetShow (Nwtwork Show) module. Network show (NetShow) commands represent a set of read-only commands. These are primarily, show commands that you can run on devices that are managed in LMS.
You can specify the commands that you want to group together and then run these commands on one or many devices. The output is displayed in a browser window.
For more details see the Using NetShow Commands section of Monitoring and Troubleshooting with Cisco Prime LAN Managmement Solution 4.2 guide.
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But Netshow does not let me export the job result into a text file for further processing. In Netconfig I have the "Export to file" option which gives me one nice text file for all switches which I can process further. I haven't found this useful option for netshow jobs. This is a vital feature for analyzing the output from more than 350 switches.
Anyway, if I run a netconfig job (which may change configuration or not) and it does give output and it is successful, I should see it in the job output, shouldn't I?