return None in _eval_evalf if expr can't be evalf-ed
return None in _eval_evalf if expr can't be evalf-ed

postvakje/sympy,kaushik94/sympy,yashsharan/sympy,mcdaniel67/sympy,souravsingh/sympy,Davidjohnwilson/sympy,madan96/sympy,sampadsaha5/sympy,ahhda/sympy,rahuldan/sympy,oliverlee/sympy,chaffra/sympy,kaichogami/sympy,jerli/sympy,oliverlee/sympy,jaimahajan1997/sympy,madan96/sympy,aktech/sympy,drufat/sympy,Titan-C/sympy,jerli/sympy,aktech/sympy,chaffra/sympy,Arafatk/sympy,lindsayad/sympy,ga7g08/sympy,rahuldan/sympy,Titan-C/sympy,Curious72/sympy,ahhda/sympy,Arafatk/sympy,mafiya69/sympy,sampadsaha5/sympy,ChristinaZografou/sympy,Davidjohnwilson/sympy,skidzo/sympy,oliverlee/sympy,mafiya69/sympy,Curious72/sympy,kaushik94/sympy,drufat/sympy,ga7g08/sympy,chaffra/sympy,ga7g08/sympy,skidzo/sympy,Shaswat27/sympy,hargup/sympy,Shaswat27/sympy,mcdaniel67/sympy,lindsayad/sympy,kaichogami/sympy,souravsingh/sympy,kaichogami/sympy,Titan-C/sympy,jerli/sympy,madan96/sympy,yashsharan/sympy,postvakje/sympy,lindsayad/sympy,hargup/sympy,yashsharan/sympy,Davidjohnwilson/sympy,mcdaniel67/sympy,drufat/sympy,skidzo/sympy,hargup/sympy,kaushik94/sympy,sampadsaha5/sympy,aktech/sympy,mafiya69/sympy,jaimahajan1997/sympy,Arafatk/sympy,ahhda/sympy,jaimahajan1997/sympy,postvakje/sympy,Shaswat27/sympy,ChristinaZografou/sympy,souravsingh/sympy,ChristinaZografou/sympy,rahuldan/sympy,Curious72/sympy