Robustify sympify(iterable)
Robustify sympify(iterable)

If the iterable didn't rebuild itself with type(a)(list), it would raise
a TypeError.  Now we just catch that and move on to the other heuristics
in sympify().  This was causing a failure in the sage tests.

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