fallback learner should maybe be a warning

Currently, the fallback learner log info is only shown during debug mode: 

https://github.com/mlr-org/mlr3/blob/dc2a983fb5b59dd0a009727b193227857cb7b9ea/R/worker.R#L94-L102

maybe this should be a warning?

	lg$debug("Calling train method of fallback '%s' on task '%s' with %i observations",
	fb$id, task$id, task$nrow, learner = fb$clone())

	fb = assert_learner(as_learner(fb))
	require_namespaces(fb$packages)
	fb$train(task)
	learner$state$fallback_state = fb$state

	lg$debug("Fitted fallback learner '%s'",

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fallback learner should maybe be a warning #972

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Uh oh!

fallback learner should maybe be a warning #972

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