Fix bug in vectorize of random variables with empty size

[ricardoV94]

Description

Bug left out from when we fixed shape=None != shape=()

Related Issue

• Closes #
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.00%. Comparing base (31bf682) to head (7673c7a).
Report is 124 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #886      +/-   ##
==========================================
- Coverage   81.00%   81.00%   -0.01%     
==========================================
  Files         170      170              
  Lines       46923    46922       -1     
  Branches    11497    11497              
==========================================
- Hits        38009    38008       -1     
- Misses       6704     6706       +2     
+ Partials     2210     2208       -2     

Files with missing lines	Coverage Δ
pytensor/tensor/random/op.py	93.75% <100.00%> (-0.04%)	⬇️

... and 2 files with indirect coverage changes