[FIX] Skip prop payouts with 0 valid shares
[FIX] Skip prop payouts with 0 valid shares

* [FIXED] Do not create 0 amount payout transactions for users w/o
  valid shares

Fixes #1569 once merged.

bankonme/php-mpos,mmitech/php-mpos,BlueDragon747/php-mpos,UNOMP/chunky-mpos,MPOS/php-mpos,machinecoin-project/php-mpos,studio666/php-mpos,sixxkilur/php-mpos,nimblecoin/web,ychaim/php-mpos,shreeneve/test,ychaim/php-mpos,sixxkilur/php-mpos,shreeneve/test,sixxkilur/php-mpos,mmitech/php-mpos,machinecoin-project/php-mpos,BlueDragon747/php-mpos,CoinHashMe/MPOS-SSO,xisi/php-mpos,CoinHashMe/MPOS-SSO,shreeneve/test,mculp/chunky-mpos,CoinHashMe/MPOS-SSO,machinecoin-project/php-mpos,bankonme/php-mpos,MPOS/php-mpos,nimblecoin/web,xisi/php-mpos,mculp/chunky-mpos,UNOMP/chunky-mpos,xisi/php-mpos,MPOS/php-mpos,CoinHashMe/MPOS-SSO,UNOMP/chunky-mpos,mculp/chunky-mpos,UNOMP/chunky-mpos,BlueDragon747/php-mpos,mculp/chunky-mpos,studio666/php-mpos,studio666/php-mpos,CoinHashMe/MPOS-SSO,mmitech/php-mpos,nimblecoin/web,bankonme/php-mpos,ychaim/php-mpos