Fix Dataset#call to work with block on MySQL
Fix Dataset#call to work with block on MySQL

mpalmer/sequel,davidbegin/sequel,pfarrell/sequel,dennis-d/custom_sequel,bigfix/sequel,nicohvi/sequel,knut2/sequel,freshpay/sequel,chef/sequel,offshore-safety/sequel,nju520/sequel,gferguson-gd/sequel,uhoh-itsmaciek/sequel,beni55/sequel,offshore-safety/sequel,gferguson-gd/sequel,mpalmer/sequel,yazshel/sequel,yazshel/sequel,knut2/sequel,seeARMS/sequel,nicohvi/sequel,reubano/sequel,offshore-safety/sequel,t-morgan/sequel,freshpay/sequel,davidbegin/sequel,nju520/sequel,pfarrell/sequel,beni55/sequel,Marketcircle/sequel,seeARMS/sequel,dennis-d/custom_sequel,reubano/sequel,t-morgan/sequel,tmm1/sequel,uhoh-itsmaciek/sequel