Getmappings failure - ungraceful error handling

[songz]

Describe the bug
On April 24, 2020 a user updated to ubuntu 20.04. Then his root user no longer has node. He installed node. But upon starting up myProxy, he no longer sees his mapping.

Looking at myProxy logs, there seems to be an error:
Error: Command failed: su - myproxy -c "pm2 jlist"

This command is used to check the status of mapping. Since this was failing, the whole mapping call fails.

Solution was to switch user to myproxy and install node. Then everything worked.