Update 46 Missing ESX patches.ps1

Cleared out $Results at start to avoid a previous module's data from being displayed if $Results isn't changed.

The missing updates plugin was displaying a previous plugin's data when Vmware.VumAutomation was not loading:
![image](https://f.cloud.github.com/assets/4061075/1110338/73222af6-1991-11e3-94e0-81a3a850d768.png)