Fix a bare except in preview.py
Fix a bare except in preview.py

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