fix: Issues / PRs should only be searched when repository is selected in Answer Engine

[wsxiaoys]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 97 lines in your changes missing coverage. Please review.

Project coverage is 57.93%. Comparing base (b7fea15) to head (ed6a760).

Files	Patch %	Lines
ee/tabby-webserver/src/service/answer.rs	0.00%	36 Missing ⚠️
crates/tabby/src/services/doc/tantivy.rs	0.00%	24 Missing ⚠️
crates/tabby-common/src/index/mod.rs	0.00%	16 Missing ⚠️
ee/tabby-webserver/src/service/repository/mod.rs	0.00%	14 Missing ⚠️
crates/tabby/src/services/doc/serper.rs	0.00%	5 Missing ⚠️
ee/tabby-webserver/src/webserver.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2703      +/-   ##
==========================================
- Coverage   58.21%   57.93%   -0.28%     
==========================================
  Files         170      170              
  Lines       15316    15395      +79     
==========================================
+ Hits         8916     8919       +3     
- Misses       6400     6476      +76     

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