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.

madan96/sympy,bukzor/sympy,yukoba/sympy,Shaswat27/sympy,jbbskinny/sympy,Curious72/sympy,drufat/sympy,kaichogami/sympy,minrk/sympy,lidavidm/sympy,Mitchkoens/sympy,rahuldan/sympy,debugger22/sympy,pandeyadarsh/sympy,Shaswat27/sympy,Gadal/sympy,sampadsaha5/sympy,liangjiaxing/sympy,MechCoder/sympy,debugger22/sympy,hrashk/sympy,kevalds51/sympy,AunShiLord/sympy,aktech/sympy,mafiya69/sympy,AunShiLord/sympy,farhaanbukhsh/sympy,atreyv/sympy,yashsharan/sympy,Arafatk/sympy,cccfran/sympy,cswiercz/sympy,skidzo/sympy,meghana1995/sympy,pandeyadarsh/sympy,shikil/sympy,yukoba/sympy,skidzo/sympy,abhiii5459/sympy,VaibhavAgarwalVA/sympy,shikil/sympy,cswiercz/sympy,atsao72/sympy,meghana1995/sympy,Sumith1896/sympy,wyom/sympy,Arafatk/sympy,ahhda/sympy,sahilshekhawat/sympy,kaichogami/sympy,dqnykamp/sympy,Vishluck/sympy,moble/sympy,ahhda/sympy,beni55/sympy,dqnykamp/sympy,sampadsaha5/sympy,iamutkarshtiwari/sympy,rahuldan/sympy,asm666/sympy,shipci/sympy,aktech/sympy,emon10005/sympy,mcdaniel67/sympy,beni55/sympy,maniteja123/sympy,yukoba/sympy,amitjamadagni/sympy,AkademieOlympia/sympy,asm666/sympy,cswiercz/sympy,sunny94/temp,shipci/sympy,mafiya69/sympy,jamesblunt/sympy,bukzor/sympy,wanglongqi/sympy,jerli/sympy,jbbskinny/sympy,grevutiu-gabriel/sympy,vipulroxx/sympy,postvakje/sympy,grevutiu-gabriel/sympy,wanglongqi/sympy,lindsayad/sympy,postvakje/sympy,AunShiLord/sympy,jerli/sympy,beni55/sympy,moble/sympy,aktech/sympy,wyom/sympy,saurabhjn76/sympy,Vishluck/sympy,Designist/sympy,lidavidm/sympy,drufat/sympy,flacjacket/sympy,mcdaniel67/sympy,MechCoder/sympy,ga7g08/sympy,sahmed95/sympy,saurabhjn76/sympy,hrashk/sympy,cccfran/sympy,abloomston/sympy,oliverlee/sympy,meghana1995/sympy,pandeyadarsh/sympy,MridulS/sympy,souravsingh/sympy,AkademieOlympia/sympy,chaffra/sympy,MridulS/sympy,pbrady/sympy,wyom/sympy,abhiii5459/sympy,dqnykamp/sympy,ChristinaZografou/sympy,MechCoder/sympy,vipulroxx/sympy,Curious72/sympy,VaibhavAgarwalVA/sympy,madan96/sympy,kaushik94/sympy,kevalds51/sympy,shipci/sympy,jamesblunt/sympy,Mitchkoens/sympy,kumarkrishna/sympy,atreyv/sympy,garvitr/sympy,toolforger/sympy,minrk/sympy,ChristinaZografou/sympy,liangjiaxing/sympy,jamesblunt/sympy,kaushik94/sympy,jaimahajan1997/sympy,atsao72/sympy,srjoglekar246/sympy,oliverlee/sympy,kaushik94/sympy,pbrady/sympy,souravsingh/sympy,Curious72/sympy,saurabhjn76/sympy,Davidjohnwilson/sympy,Shaswat27/sympy,ga7g08/sympy,emon10005/sympy,sahilshekhawat/sympy,souravsingh/sympy,kaichogami/sympy,kumarkrishna/sympy,chaffra/sympy,toolforger/sympy,yashsharan/sympy,jbbskinny/sympy,pernici/sympy,lindsayad/sympy,AkademieOlympia/sympy,amitjamadagni/sympy,iamutkarshtiwari/sympy,ChristinaZografou/sympy,sahmed95/sympy,sampadsaha5/sympy,liangjiaxing/sympy,Titan-C/sympy,Arafatk/sympy,abloomston/sympy,toolforger/sympy,atsao72/sympy,Vishluck/sympy,sahmed95/sympy,postvakje/sympy,kmacinnis/sympy,sunny94/temp,rahuldan/sympy,emon10005/sympy,Designist/sympy,shikil/sympy,drufat/sympy,cccfran/sympy,diofant/diofant,jaimahajan1997/sympy,kmacinnis/sympy,yashsharan/sympy,Davidjohnwilson/sympy,Mitchkoens/sympy,maniteja123/sympy,VaibhavAgarwalVA/sympy,bukzor/sympy,jerli/sympy,Designist/sympy,madan96/sympy,mcdaniel67/sympy,Titan-C/sympy,Gadal/sympy,garvitr/sympy,grevutiu-gabriel/sympy,Titan-C/sympy,hargup/sympy,mafiya69/sympy,sunny94/temp,abloomston/sympy,oliverlee/sympy,ahhda/sympy,kumarkrishna/sympy,moble/sympy,jaimahajan1997/sympy,debugger22/sympy,iamutkarshtiwari/sympy,chaffra/sympy,farhaanbukhsh/sympy,kevalds51/sympy,hargup/sympy,Sumith1896/sympy,skirpichev/omg,wanglongqi/sympy,pbrady/sympy,hrashk/sympy,Sumith1896/sympy,Davidjohnwilson/sympy,maniteja123/sympy,farhaanbukhsh/sympy,abhiii5459/sympy,vipulroxx/sympy,asm666/sympy,kmacinnis/sympy,hargup/sympy,garvitr/sympy,ga7g08/sympy,skidzo/sympy,lidavidm/sympy,lindsayad/sympy,MridulS/sympy,Gadal/sympy,sahilshekhawat/sympy,atreyv/sympy