Describe the bug

$ govc vcsa.net.proxy.info -json=true
{}

But the same command works when we -json=false

> ./govc vcsa.net.proxy.info -json=false

HTTP proxy:          Disabled
HTTPS proxy:         Disabled
FTP proxy:           Disabled
No Proxy addresses:  localhost, 127.0.0.1

To Reproduce
Steps to reproduce the behavior:

1. Install VC
2. Install govc
3. Run govc vcsa.net.proxy.info -json=true

Expected behavior
govc vcsa.net.proxy.info -json=true should provide output in json format

Affected version
Latest