Return from sse loop when sseclient.Notify() fails #813

Job	Run time
docker-build	43s
test	6m 9s
build (linux, amd64)	35s
lint	1m 9s
build (linux, 386)	30s
build (linux, arm)	36s
build (linux, arm64)	35s
build (darwin, amd64)	33s
build (darwin, arm64)	34s
build (windows, amd64)	35s
build (windows, 386)	45s
build (windows, arm)	30s
build (windows, arm64)	35s
integration-test-serverside (f0023141ec429d912e329665f937d05b178a3fee)	1m 49s
integration-test-clientside (v0.13.2)	1m 54s
analyze	1m 48s
	19m 20s

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