fix: panic rueidisotel without MetricAttrs and TraceAttrs

[rueian]

Fixes #478

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.78%. Comparing base (933c142) to head (d9c9b99).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #479      +/-   ##
==========================================
+ Coverage   98.77%   98.78%   +0.01%     
==========================================
  Files          59       59              
  Lines       26207    26207              
==========================================
+ Hits        25886    25889       +3     
+ Misses        310      308       -2     
+ Partials       11       10       -1     

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