When using browser.restart() in tests, intermittently get invalid session id

[chrisreed-sag]

Some of our tests use browser.restart(). Such tests intermittently fail after the last test has run with:

[14:19:16] I/plugins - �[31m 	 Fail:  protractor-console Plugin Tests �[39m
[14:19:16] E/plugins - 		Failure during postTest: invalid session id
[14:19:16] E/plugins - 		NoSuchSessionError: invalid session id
		    at Object.throwDecodedError (/work/teamcity/work/93e4422f8744bcca/src/output-amd64-rhel7/web-app/build/node_modules/selenium-webdriver/lib/error.js:514:15)
		    at parseHttpResponse (/work/teamcity/work/93e4422f8744bcca/src/output-amd64-rhel7/web-app/build/node_modules/selenium-webdriver/lib/http.js:519:13)
		    at doSend.then.response (/work/teamcity/work/93e4422f8744bcca/src/output-amd64-rhel7/web-app/build/node_modules/selenium-webdriver/lib/http.js:441:30)
		    at process._tickCallback (internal/process/next_tick.js:68:7)

We have worked around this by wrapping the plugin and adding .catch(_ => null) to ignore exceptions.