Fix bug in add default options

[pkofod]

Fixes #1038 and #1041

[codecov]

Codecov Report

Merging #1043 (fe2fa7d) into master (1fc8255) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head fe2fa7d differs from pull request most recent head 4e60e2c. Consider uploading reports for the commit 4e60e2c to get more accurate results

@@            Coverage Diff             @@
##           master    #1043      +/-   ##
==========================================
- Coverage   85.35%   85.32%   -0.04%     
==========================================
  Files          43       43              
  Lines        3202     3202              
==========================================
- Hits         2733     2732       -1     
- Misses        469      470       +1     

Impacted Files	Coverage Δ
src/multivariate/optimize/interface.jl	83.96% <100.00%> (+1.88%)	⬆️

... and 1 file with indirect coverage changes