fix: Skip EOF error when default empty yaml file

[congqixia]

Related to #37404

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.98%. Comparing base (b83b376) to head (5eb6eef).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/config/file_source.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37445      +/-   ##
==========================================
- Coverage   83.26%   80.98%   -2.28%     
==========================================
  Files        1015     1305     +290     
  Lines      157473   182899   +25426     
==========================================
+ Hits       131115   148117   +17002     
- Misses      21166    29566    +8400     
- Partials     5192     5216      +24     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	67.17% <ø> (∅)
Go	83.23% <0.00%> (-0.05%)	⬇️

Files with missing lines	Coverage Δ
pkg/config/file_source.go	77.14% <0.00%> (ø)

... and 313 files with indirect coverage changes

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[weiliu1031]

/lgtm