allow null value for loanProduct default princial value
MLITE-350
Merge branch 'v1.17_Release' of https://github.com/Musoni/mifosx into v1.17_Release
adjusted loan repayment receipt number min chars length to 200
Merge branch 'v1.17_Release' of https://github.com/Musoni/mifosx into v1.17_Release