fix: cannot start without specify initial cluster

[localvar]

No description provided.

[codecov-commenter]

Codecov Report

Merging #656 (5ff0aae) into pipeline (84fc70a) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           pipeline     #656      +/-   ##
============================================
+ Coverage     78.84%   78.87%   +0.02%     
============================================
  Files            93       93              
  Lines         10039    10039              
============================================
+ Hits           7915     7918       +3     
+ Misses         1656     1654       -2     
+ Partials        468      467       -1     

Impacted Files	Coverage Δ
pkg/object/mqttproxy/client.go	79.72% <0.00%> (-0.91%)	⬇️
pkg/filters/validator/basicauth.go	78.80% <0.00%> (+1.38%)	⬆️
pkg/filters/headerlookup/headerlookup.go	86.11% <0.00%> (+1.38%)	⬆️

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