nil pointer when defining vars (not yet filled) and then calling "devspace use space"

[LukasGentele]

What happened?
Panic reporting a nil pointer

What did you expect to happen instead?
No nil pointer

How can we reproduce the bug? (as minimally and precisely as possible)

1. Initialize a project
2. Create a space
3. Create devspace-configs.yaml and define something in vars
4. Call devspace use space => nil pointer because devspace use space saves generated.yaml which strips the vars section which should actually be an empty map as per LoadConfig

Local Environment:

• Operating System: windows

/kind bug