'npm run posttest' fails when COVERALLS_REPO_TOKEN is unset

[farmisen]

NP-1B45EDC80F2C:chai-http farmisen$ unset COVERALLS_REPO_TOKEN
NP-1B45EDC80F2C:chai-http farmisen$ npm run posttest

> chai-http@2.0.0 posttest /Users/farmisen/dev/occamz/chai-http
> if [ -z $COVERALLS_REPO_TOKEN ]; then cat coverage/lcov.info | coveralls; fi


/Users/farmisen/dev/occamz/chai-http/node_modules/coveralls/bin/coveralls.js:18
        throw err;
        ^
Bad response: 422 {"message":"Couldn't find a repository matching this job.","error":true}

seems like the bash test for COVERALLS_REPO_TOKEN presence is backward.