Deleting the content of the npmrc setting does not revert back to template value

[hardillb]

Current Behavior

• add npmrc value to template (unlocked)
• start instance with template
• edit instance npmrc file to new value
• later want default template value back, delete all content from npmrc field

The value is now empty and no way to signal you want the template value back

Expected Behavior

Tricky, not sure about this one. 2 options

1. current behaviour is correct as removing the content is a valid state
2. if empty should revert to template value

Steps To Reproduce

See current behaviour

Environment

• FlowFuse version: 2.7.0
• Node.js version: 18.x
• npm version: 9.x
• Platform/OS: All
• Browser: All

Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate