Fix exception messages when Sequel.string_to_* fail
Fix exception messages when Sequel.string_to_* fail

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