Fix issue in instance.js for getDefault() on Property object
Fix issue in instance.js for getDefault() on Property object

thecodingmachine/mouf,moufmouf/mouf,moufmouf/mouf,thecodingmachine/mouf,alexisprevot/mouf,moufmouf/harmony,thecodingmachine/harmony,alexisprevot/mouf,marcteyssier/mouf,thecodingmachine/harmony,xhuberty/mouf,marcteyssier/mouf,marcteyssier/mouf,moufmouf/harmony,marcteyssier/mouf,xhuberty/mouf,moufmouf/harmony,thecodingmachine/harmony,alexisprevot/mouf,thecodingmachine/harmony,thecodingmachine/mouf,moufmouf/mouf,thecodingmachine/mouf,moufmouf/harmony,moufmouf/mouf,xhuberty/mouf,alexisprevot/mouf,xhuberty/mouf