Skip sentry.message.template when there are no parameters

[solnic]

Closes #2691

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.31%. Comparing base (5a2a6b9) to head (ca0ba41).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2700      +/-   ##
==========================================
+ Coverage   97.29%   97.31%   +0.02%     
==========================================
  Files         144      144              
  Lines        5647     5652       +5     
==========================================
+ Hits         5494     5500       +6     
+ Misses        153      152       -1     

Components	Coverage Δ
sentry-ruby	97.77% <100.00%> (+<0.01%)	⬆️
sentry-rails	95.61% <ø> (ø)
sentry-sidekiq	96.57% <ø> (ø)
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	99.31% <ø> (+0.68%)	⬆️

Files with missing lines	Coverage Δ
sentry-ruby/lib/sentry/log_event.rb	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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