Multiplication between ScalMat and AbstractZeros

[Wu-Chenyang]

#401

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.48%. Comparing base (6f61dc3) to head (9d7cca3).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
- Coverage   99.91%   99.48%   -0.44%     
==========================================
  Files           8        8              
  Lines        1147     1157      +10     
==========================================
+ Hits         1146     1151       +5     
- Misses          1        6       +5     

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[jishnub]

Test failure in Optim.jl seems unrelated (their CI is broken anyway). Perhaps we need to disable the tests against Optim until this is fixed, to make life easier.