added a check that package json files are valid
added a check that package json files are valid

ThuyNTran/datawrapper,robmcloughlin/Insights,plusgut/datawrapper,datafunk/datawrapper,kendrick-k/datawrapper,elaOnMars/datawrapper,ThuyNTran/datawrapper,datafunk/datawrapper,robmcloughlin/Insights,grepman/datawrapper,motherjones/datawrapper,plusgut/datawrapper,datafunk/datawrapper,motherjones/datawrapper,rubensfernando/datawrapper,rubensfernando/datawrapper,grepman/datawrapper,kendrick-k/datawrapper,elaOnMars/datawrapper,elaOnMars/datawrapper,plusgut/datawrapper,robmcloughlin/Insights,qqming113/datawrapper,devinit/datawrapper,ThuyNTran/datawrapper,qqming113/datawrapper,motherjones/datawrapper,devinit/datawrapper,ThuyNTran/datawrapper,elaOnMars/datawrapper,kendrick-k/datawrapper,kendrick-k/datawrapper,grepman/datawrapper,devinit/datawrapper,devinit/datawrapper,robmcloughlin/Insights,devinit/datawrapper,qqming113/datawrapper,datafunk/datawrapper,motherjones/datawrapper,washingtonpost/datawrapper,plusgut/datawrapper,washingtonpost/datawrapper,washingtonpost/datawrapper,ThuyNTran/datawrapper,washingtonpost/datawrapper,motherjones/datawrapper,elaOnMars/datawrapper,rubensfernando/datawrapper,qqming113/datawrapper,qqming113/datawrapper,rubensfernando/datawrapper,datafunk/datawrapper,grepman/datawrapper,robmcloughlin/Insights,washingtonpost/datawrapper,datafunk/datawrapper,rubensfernando/datawrapper,grepman/datawrapper,grepman/datawrapper,elaOnMars/datawrapper,qqming113/datawrapper,washingtonpost/datawrapper,motherjones/datawrapper,devinit/datawrapper,kendrick-k/datawrapper,ThuyNTran/datawrapper,kendrick-k/datawrapper