Add explit returns to SDDP.parameterize functions

[odow]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.35%. Comparing base (15646ec) to head (c5e51a2).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #885   +/-   ##
=======================================
  Coverage   96.35%   96.35%           
=======================================
  Files          28       28           
  Lines        4031     4032    +1     
=======================================
+ Hits         3884     3885    +1     
  Misses        147      147           

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