fix the panic when the active endpoints of gateway is nil/empty

[River-sh]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 41.17647% with 10 lines in your changes missing coverage. Please review.

Project coverage is 16.90%. Comparing base (7cd6b50) to head (d86de52).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/proxyengine/proxyserver/manageheader.go	46.66%	6 Missing and 2 partials ⚠️
pkg/proxyengine/proxyserver/interceptor.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
+ Coverage   15.94%   16.90%   +0.96%     
==========================================
  Files          33       33              
  Lines        4315     4324       +9     
==========================================
+ Hits          688      731      +43     
+ Misses       3465     3427      -38     
- Partials      162      166       +4     

Flag	Coverage Δ
unittests	16.90% <41.17%> (+0.96%)	⬆️

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[YTGhost]

LGTM