Fix traceback from issue 1418
Fix traceback from issue 1418

The integral engine is still unable to handle the integral, but it now
gracefully returns an Integral instead of giving a traceback.

mafiya69/sympy,grevutiu-gabriel/sympy,Davidjohnwilson/sympy,abhiii5459/sympy,sahmed95/sympy,ga7g08/sympy,Titan-C/sympy,kaushik94/sympy,AunShiLord/sympy,postvakje/sympy,kmacinnis/sympy,sahilshekhawat/sympy,Curious72/sympy,farhaanbukhsh/sympy,hrashk/sympy,dqnykamp/sympy,VaibhavAgarwalVA/sympy,yukoba/sympy,toolforger/sympy,rahuldan/sympy,AkademieOlympia/sympy,rahuldan/sympy,hargup/sympy,kaichogami/sympy,abhiii5459/sympy,diofant/diofant,Curious72/sympy,ahhda/sympy,wanglongqi/sympy,AkademieOlympia/sympy,oliverlee/sympy,sunny94/temp,abloomston/sympy,mafiya69/sympy,Sumith1896/sympy,skidzo/sympy,sampadsaha5/sympy,atreyv/sympy,jamesblunt/sympy,Shaswat27/sympy,jbbskinny/sympy,emon10005/sympy,amitjamadagni/sympy,kaichogami/sympy,sunny94/temp,lidavidm/sympy,aktech/sympy,jerli/sympy,cccfran/sympy,jerli/sympy,pandeyadarsh/sympy,beni55/sympy,sampadsaha5/sympy,lindsayad/sympy,madan96/sympy,MridulS/sympy,dqnykamp/sympy,sahmed95/sympy,mcdaniel67/sympy,postvakje/sympy,oliverlee/sympy,vipulroxx/sympy,MridulS/sympy,Vishluck/sympy,MridulS/sympy,jamesblunt/sympy,yukoba/sympy,atsao72/sympy,shikil/sympy,VaibhavAgarwalVA/sympy,wanglongqi/sympy,bukzor/sympy,kumarkrishna/sympy,cccfran/sympy,beni55/sympy,madan96/sympy,Designist/sympy,ga7g08/sympy,amitjamadagni/sympy,cswiercz/sympy,jaimahajan1997/sympy,mcdaniel67/sympy,Gadal/sympy,hrashk/sympy,souravsingh/sympy,Vishluck/sympy,ChristinaZografou/sympy,kmacinnis/sympy,bukzor/sympy,grevutiu-gabriel/sympy,kmacinnis/sympy,AkademieOlympia/sympy,chaffra/sympy,oliverlee/sympy,cccfran/sympy,Mitchkoens/sympy,yashsharan/sympy,ChristinaZografou/sympy,kumarkrishna/sympy,Davidjohnwilson/sympy,jerli/sympy,meghana1995/sympy,ga7g08/sympy,pandeyadarsh/sympy,Sumith1896/sympy,lidavidm/sympy,toolforger/sympy,abhiii5459/sympy,wyom/sympy,farhaanbukhsh/sympy,chaffra/sympy,abloomston/sympy,iamutkarshtiwari/sympy,moble/sympy,souravsingh/sympy,lindsayad/sympy,beni55/sympy,lindsayad/sympy,atsao72/sympy,jbbskinny/sympy,hrashk/sympy,Sumith1896/sympy,kaushik94/sympy,skirpichev/omg,atsao72/sympy,MechCoder/sympy,shikil/sympy,Mitchkoens/sympy,MechCoder/sympy,AunShiLord/sympy,hargup/sympy,dqnykamp/sympy,asm666/sympy,toolforger/sympy,Titan-C/sympy,farhaanbukhsh/sympy,MechCoder/sympy,wanglongqi/sympy,abloomston/sympy,grevutiu-gabriel/sympy,debugger22/sympy,madan96/sympy,lidavidm/sympy,shipci/sympy,Gadal/sympy,emon10005/sympy,meghana1995/sympy,asm666/sympy,pbrady/sympy,Designist/sympy,iamutkarshtiwari/sympy,maniteja123/sympy,drufat/sympy,chaffra/sympy,yashsharan/sympy,iamutkarshtiwari/sympy,pbrady/sympy,yukoba/sympy,liangjiaxing/sympy,drufat/sympy,wyom/sympy,Arafatk/sympy,atreyv/sympy,kaichogami/sympy,sahmed95/sympy,mcdaniel67/sympy,liangjiaxing/sympy,yashsharan/sympy,bukzor/sympy,hargup/sympy,garvitr/sympy,souravsingh/sympy,drufat/sympy,cswiercz/sympy,atreyv/sympy,pandeyadarsh/sympy,saurabhjn76/sympy,Arafatk/sympy,Designist/sympy,Mitchkoens/sympy,Shaswat27/sympy,VaibhavAgarwalVA/sympy,liangjiaxing/sympy,debugger22/sympy,vipulroxx/sympy,emon10005/sympy,shipci/sympy,moble/sympy,saurabhjn76/sympy,garvitr/sympy,Davidjohnwilson/sympy,sampadsaha5/sympy,kevalds51/sympy,jaimahajan1997/sympy,jaimahajan1997/sympy,sunny94/temp,moble/sympy,shipci/sympy,asm666/sympy,kaushik94/sympy,shikil/sympy,ChristinaZografou/sympy,garvitr/sympy,jbbskinny/sympy,wyom/sympy,vipulroxx/sympy,kumarkrishna/sympy,maniteja123/sympy,cswiercz/sympy,Titan-C/sympy,mafiya69/sympy,skidzo/sympy,rahuldan/sympy,sahilshekhawat/sympy,AunShiLord/sympy,pbrady/sympy,Arafatk/sympy,maniteja123/sympy,skidzo/sympy,postvakje/sympy,kevalds51/sympy,kevalds51/sympy,saurabhjn76/sympy,ahhda/sympy,aktech/sympy,sahilshekhawat/sympy,Shaswat27/sympy,meghana1995/sympy,jamesblunt/sympy,Curious72/sympy,ahhda/sympy,aktech/sympy,debugger22/sympy,Gadal/sympy,Vishluck/sympy