Only test Sage if bin/test is present
Only test Sage if bin/test is present

In our release tarball bin/test is missing (because we do not want it to get
installed), so we cannot use it to test Sage.

hargup/sympy,yashsharan/sympy,sampadsaha5/sympy,Titan-C/sympy,madan96/sympy,souravsingh/sympy,yashsharan/sympy,drufat/sympy,skidzo/sympy,hargup/sympy,ChristinaZografou/sympy,rahuldan/sympy,postvakje/sympy,drufat/sympy,souravsingh/sympy,kaushik94/sympy,Titan-C/sympy,Titan-C/sympy,jaimahajan1997/sympy,postvakje/sympy,aktech/sympy,ChristinaZografou/sympy,chaffra/sympy,aktech/sympy,skidzo/sympy,rahuldan/sympy,souravsingh/sympy,chaffra/sympy,skidzo/sympy,madan96/sympy,ChristinaZografou/sympy,jaimahajan1997/sympy,sampadsaha5/sympy,kaushik94/sympy,rahuldan/sympy,drufat/sympy,madan96/sympy,aktech/sympy,kaushik94/sympy,hargup/sympy,yashsharan/sympy,sampadsaha5/sympy,jaimahajan1997/sympy,postvakje/sympy,chaffra/sympy