investigation(params/extras): do we need ChainConfig nil checks in method calls?

[qdm12]

Some of the ChainConfig methods have a nil check on the receiving object, for example:

coreth/params/extras/config.go

Lines 174 to 176 in a7f7061

	if c == nil {
	return nil
	}

Whilst some other methods don't.
Should we require these everywhere or remove them everywhere? I would lean on removing them to let the caller do the nil check, to avoid silently having funny results.