Check if stream is already closed #732

Job	Run time
Detect Changes	6s
constantpredictor/iris	3m 4s
constantpredictor/kc2	54s
constantpredictor/cholesterol	53s
randomforest/iris	1m 23s
randomforest/kc2	1m 19s
randomforest/cholesterol	1m 14s
autogluon/iris	1m 51s
autogluon/kc2	1m 48s
autogluon/cholesterol	1m 58s
autogluon/iris	28s
autogluon/kc2	26s
autogluon/cholesterol	28s
autosklearn/iris	28s
autosklearn/kc2	27s
autosklearn/cholesterol	27s
gama/iris	27s
gama/kc2	26s
gama/cholesterol	27s
h2oautoml/iris	26s
h2oautoml/kc2	26s
h2oautoml/cholesterol	26s
mlplanweka/iris	13s
mlplanweka/kc2	12s
mlplanweka/cholesterol	13s
mlr3automl/iris	14s
mlr3automl/kc2	25s
mlr3automl/cholesterol	26s
naiveautoml/iris	1s
naiveautoml/kc2	26s
naiveautoml/cholesterol	1s
tpot/iris	1s
tpot/kc2	1s
tpot/cholesterol	1s
tunedrandomforest/iris	1s
tunedrandomforest/kc2	1s
tunedrandomforest/cholesterol	1s
	22m 9s

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