af-structs.zapt generates empty structs instead of 'typedef uint8_t'

[vivien-apple]

You should probably not take it on faith.

If you look at it twice you may noticed that there are some empty structs. For example:

With ZAP templates:

// Struct for Signature
typedef struct _Signature
{
} EmberAfSignature;

With AppBuilder:

// Void typedef for EphemeralData which is empty.
// this will result in all the references to the data being as uint8_t*
typedef uint8_t EphemeralData;

It does work because those are not used. I will open an issue for them.

Originally posted by @vivien-apple in #3826 (comment)