fix: fix operator crashed in func generateNodeCookieSecret

[Rory-Z]

No description provided.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (aaa103c) 77.92% compared to head (3a57b8f) 77.90%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
controllers/apps/v2beta1/emqx_controller.go	20.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #977      +/-   ##
==========================================
- Coverage   77.92%   77.90%   -0.03%     
==========================================
  Files          67       67              
  Lines        6085     6088       +3     
==========================================
+ Hits         4742     4743       +1     
- Misses       1121     1122       +1     
- Partials      222      223       +1     

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