Abort payout process if missing share_id
Abort payout process if missing share_id

As discussed in #392 we should abort any payouts for rounds until the
issue is fixed.

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