fix(plugin-phone): update the Call#mediaConnection property to not assume there will always be at least one entry
fix(plugin-phone): update the Call#mediaConnection property to not
assume there will always be at least one entry

Fixes #431

bbender/spark-js-sdk,aimeex3/spark-js-sdk,adamweeks/spark-js-sdk,aimeex3/spark-js-sdk,mwegman/spark-js-sdk,aimeex3/spark-js-sdk,ianwremmel/spark-js-sdk,ianwremmel/spark-js-sdk,adamweeks/spark-js-sdk,tran2/spark-js-sdk,mwegman/spark-js-sdk,adamweeks/spark-js-sdk,ciscospark/spark-js-sdk,tran2/spark-js-sdk,bbender/spark-js-sdk,nickclar/spark-js-sdk,bbender/spark-js-sdk,urbenlegend/spark-js-sdk,urbenlegend/spark-js-sdk,CiscoHRIT/spark-js-sdk,ciscospark/spark-js-sdk,CiscoHRIT/spark-js-sdk,nickclar/spark-js-sdk,mwegman/spark-js-sdk