chore(karma): prevent failure on empty test suites
chore(karma): prevent failure on empty test suites

adamweeks/spark-js-sdk,mwegman/spark-js-sdk,bbender/spark-js-sdk,mwegman/spark-js-sdk,adamweeks/spark-js-sdk,adamweeks/spark-js-sdk,bbender/spark-js-sdk,aimeex3/spark-js-sdk,bbender/spark-js-sdk,aimeex3/spark-js-sdk,aimeex3/spark-js-sdk,mwegman/spark-js-sdk