Expanding "Assignment to Entry in Nil Map" with struct fields

[abitrolly]

It may worth expanding https://containersolutions.github.io/runbooks/posts/golang/assignment-to-entry-in-nil-map/ with a case when map is a part of a struct.

While the solution is the same, the difficulty is to find the right place to initialize the struct, which most likely will be "NewSomething" function.

https://stackoverflow.com/questions/27553399/golang-how-to-initialize-a-map-field-within-a-struct