Fixed #8836: Added a check whether returned tuple from bkey function exists or not
Fixed #8836: Added a check whether returned tuple from bkey function exists or not

vipulroxx/sympy,AunShiLord/sympy,Designist/sympy,Mitchkoens/sympy,pbrady/sympy,abhiii5459/sympy,sampadsaha5/sympy,wyom/sympy,Davidjohnwilson/sympy,atreyv/sympy,oliverlee/sympy,skidzo/sympy,chaffra/sympy,jaimahajan1997/sympy,kevalds51/sympy,aktech/sympy,shikil/sympy,meghana1995/sympy,pbrady/sympy,hargup/sympy,kaichogami/sympy,vipulroxx/sympy,ChristinaZografou/sympy,mafiya69/sympy,meghana1995/sympy,moble/sympy,hargup/sympy,vipulroxx/sympy,lindsayad/sympy,skidzo/sympy,mcdaniel67/sympy,wanglongqi/sympy,moble/sympy,sahmed95/sympy,debugger22/sympy,mafiya69/sympy,iamutkarshtiwari/sympy,madan96/sympy,jerli/sympy,sahilshekhawat/sympy,kevalds51/sympy,Shaswat27/sympy,drufat/sympy,souravsingh/sympy,yukoba/sympy,oliverlee/sympy,ahhda/sympy,AkademieOlympia/sympy,jerli/sympy,sahilshekhawat/sympy,Mitchkoens/sympy,postvakje/sympy,Davidjohnwilson/sympy,abhiii5459/sympy,debugger22/sympy,Shaswat27/sympy,liangjiaxing/sympy,drufat/sympy,Davidjohnwilson/sympy,abloomston/sympy,cswiercz/sympy,MechCoder/sympy,AkademieOlympia/sympy,madan96/sympy,AunShiLord/sympy,Vishluck/sympy,asm666/sympy,atreyv/sympy,ahhda/sympy,yukoba/sympy,sahmed95/sympy,debugger22/sympy,kaichogami/sympy,chaffra/sympy,asm666/sympy,abloomston/sympy,skidzo/sympy,Designist/sympy,grevutiu-gabriel/sympy,atreyv/sympy,Vishluck/sympy,garvitr/sympy,cswiercz/sympy,hargup/sympy,Gadal/sympy,Gadal/sympy,wanglongqi/sympy,ga7g08/sympy,pandeyadarsh/sympy,postvakje/sympy,Curious72/sympy,madan96/sympy,farhaanbukhsh/sympy,wyom/sympy,jaimahajan1997/sympy,emon10005/sympy,toolforger/sympy,rahuldan/sympy,AunShiLord/sympy,lindsayad/sympy,atsao72/sympy,sampadsaha5/sympy,toolforger/sympy,grevutiu-gabriel/sympy,VaibhavAgarwalVA/sympy,maniteja123/sympy,grevutiu-gabriel/sympy,pbrady/sympy,ChristinaZografou/sympy,mafiya69/sympy,asm666/sympy,oliverlee/sympy,Titan-C/sympy,aktech/sympy,wanglongqi/sympy,yashsharan/sympy,Mitchkoens/sympy,kumarkrishna/sympy,skirpichev/omg,MechCoder/sympy,aktech/sympy,AkademieOlympia/sympy,abhiii5459/sympy,Arafatk/sympy,bukzor/sympy,kaushik94/sympy,ga7g08/sympy,kaichogami/sympy,garvitr/sympy,souravsingh/sympy,bukzor/sympy,mcdaniel67/sympy,yukoba/sympy,MechCoder/sympy,iamutkarshtiwari/sympy,kaushik94/sympy,yashsharan/sympy,VaibhavAgarwalVA/sympy,Curious72/sympy,cswiercz/sympy,postvakje/sympy,pandeyadarsh/sympy,lindsayad/sympy,jbbskinny/sympy,bukzor/sympy,Curious72/sympy,meghana1995/sympy,chaffra/sympy,atsao72/sympy,saurabhjn76/sympy,sahmed95/sympy,farhaanbukhsh/sympy,yashsharan/sympy,wyom/sympy,garvitr/sympy,saurabhjn76/sympy,ChristinaZografou/sympy,Designist/sympy,abloomston/sympy,ahhda/sympy,saurabhjn76/sympy,jbbskinny/sympy,Arafatk/sympy,mcdaniel67/sympy,Gadal/sympy,souravsingh/sympy,farhaanbukhsh/sympy,Titan-C/sympy,Sumith1896/sympy,sampadsaha5/sympy,maniteja123/sympy,rahuldan/sympy,ga7g08/sympy,moble/sympy,pandeyadarsh/sympy,kumarkrishna/sympy,jerli/sympy,shikil/sympy,shikil/sympy,Sumith1896/sympy,emon10005/sympy,Sumith1896/sympy,rahuldan/sympy,toolforger/sympy,liangjiaxing/sympy,drufat/sympy,Titan-C/sympy,Shaswat27/sympy,emon10005/sympy,jaimahajan1997/sympy,jbbskinny/sympy,diofant/diofant,iamutkarshtiwari/sympy,Arafatk/sympy,kevalds51/sympy,kumarkrishna/sympy,VaibhavAgarwalVA/sympy,liangjiaxing/sympy,kaushik94/sympy,sahilshekhawat/sympy,Vishluck/sympy,atsao72/sympy,maniteja123/sympy