Race condition with medic.json causing build failures

There appears to be a race condition of some sort with the medic.json file that causes builds to sometimes fail. Happens in Windows and OSX. Stack traces contained in links.

===
Log Content:
fs.js:500
return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
^
Error: ENOENT, no such file or directory 'mobilespec/www/medic.json'
at Error (native)
at Object.fs.openSync (fs.js:500:18)
at Object.fs.writeFileSync (fs.js:1099:15)
at createMedicJson (/Users/buildbot/slaves/apache/cordova-android-osx/cordova-medic/medic/medic-run.js:86:8)
at /Users/buildbot/slaves/apache/cordova-android-osx/cordova-medic/medic/medic-run.js:356:9
at Request.<anonymous> (/Users/buildbot/slaves/apache/cordova-android-osx/cordova-medic/medic/medic-run.js:305:9)
at Request.emit (events.js:107:17)
at Request.onRequestResponse (/Users/buildbot/slaves/apache/cordova-android-osx/cordova-medic/node_modules/request/request.js:1156:10)
at ClientRequest.emit (events.js:107:17)
at HTTPParser.parserOnIncomingClient [as onIncoming] (_http_client.js:426:21)