Updated os_network_wifi_ssid.ps1 to account for null values e.g. not connected to wifi
Updated os_network_wifi_ssid.ps1 to account for null values e.g. not connected to wifi

Signed-off-by: Josue Negron <91d5690d54c0e3f0824610e08ff1638231b9532a@vmware.com>

vmwaresamples/AirWatch-samples,vmwaresamples/AirWatch-samples,vmwaresamples/AirWatch-samples,vmwaresamples/AirWatch-samples