fix: only send data if the socket is open #96

Job	Run time
check	1m 5s
test-chrome-webworker	30s
test-electron-renderer	18s
test-chrome	34s
test-electron-main	32s
test-firefox	41s
test-firefox-webworker	42s
test-webkit (ubuntu-latest, lts/*)	20s
test-webkit (macos-latest, lts/*)	1m 37s
test-node (windows-latest, lts/*)	1m 32s
test-node (ubuntu-latest, lts/*)	33s
test-node (macos-latest, lts/*)	1m 26s
test-webkit-webworker (ubuntu-latest, lts/*)	23s
test-webkit-webworker (macos-latest, lts/*)	1m 28s
release	0s
	11m 41s

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