Fix #8836: Add version to fqn when version==0

[aranke]

resolves #8836

Problem

dbt ls --select something was failing with IndexError because we weren't adding version to fqn when version == 0.

Solution

Change check from if version to if version is not None to add version to fqn when version == 0.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6aeebc4) 86.31% compared to head (b707f81) 86.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8915      +/-   ##
==========================================
+ Coverage   86.31%   86.32%   +0.01%     
==========================================
  Files         177      177              
  Lines       26385    26385              
==========================================
+ Hits        22775    22778       +3     
+ Misses       3610     3607       -3     

Flag	Coverage Δ
integration	83.11% <100.00%> (+0.01%)	⬆️
unit	64.58% <100.00%> (ø)

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Files	Coverage Δ
core/dbt/contracts/graph/node_args.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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