Fix: empty doc selection in /stream

[ManishMadan2882]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  • Purged selectedDocs from /stream endpoint
  • Chunks will be set to zero in case of isNoneDoc (Empty).
• Why was this change needed? (You can also link to an open issue here)
  Fixes 🐛 Bug Report: Empty document uses default document #948

[vercel]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 33.63%. Comparing base (05f7569) to head (1627d42).
Report is 56 commits behind head on main.

Files with missing lines	Patch %	Lines
application/api/answer/routes.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1384      +/-   ##
==========================================
+ Coverage   33.45%   33.63%   +0.18%     
==========================================
  Files          64       65       +1     
  Lines        3273     3297      +24     
==========================================
+ Hits         1095     1109      +14     
- Misses       2178     2188      +10     

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[dartpain]

Lgtm