baseapp: Init contradictorily checks if app.cms == nil after invoking app.setState which blindly dereferences app.cms + app.Seal which will cause nil pointer panics or prevent any progress since sealed=true

[odeke-em]

If we examine this code

cosmos-sdk/baseapp/baseapp.go

Lines 429 to 437 in 570ab64

	// needed for the export command which inits from store but never calls initchain
	app.setState(execModeCheck, emptyHeader)
	app.Seal()
	if app.cms == nil {
	return errors.New("commit multi-store must not be nil")
	}
	return app.cms.GetPruning().Validate()

we can see that app.setState is invoked and its code is

cosmos-sdk/baseapp/baseapp.go

Line 481 in 570ab64

func (app *BaseApp) setState(mode execMode, header cmtproto.Header) {

and it nakedly invokes app.cms

But later down we have a check for app.cms == nil

cosmos-sdk/baseapp/baseapp.go

Lines 433 to 436 in 570ab64

	if app.cms == nil {
	return errors.New("commit multi-store must not be nil")
	}

That's a contradiction right there and would result in a nil panic, even more by invoking app.Seal() firstly we make it so that any failure thats fixed by now setting a cms then that's rechecked then .Init() is retried will just fail with no meaningful progress. We should move that check up before setState