Fix expand_log for negative terms again.
Fix expand_log for negative terms again.

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