Add missing return value to deprecated functions

[Sichao25]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (a053564) 22.94% compared to head (3a30602) 23.03%.
Report is 56 commits behind head on master.

Files	Patch %	Lines
dynamo/tools/deprecated.py	0.00%	17 Missing ⚠️
dynamo/preprocessing/deprecated.py	12.50%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #663      +/-   ##
==========================================
+ Coverage   22.94%   23.03%   +0.09%     
==========================================
  Files         160      161       +1     
  Lines       27645    27761     +116     
==========================================
+ Hits         6342     6396      +54     
- Misses      21303    21365      +62     

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