FIX: Ensure retry_count is set when checking if a job is being retried (#36034)

When checking how many times an email job has been retried, we need to check
that the `retry_count` attribute has been set.

In a related error, the `UserEmail` retry wait handler assumed that the
triggering exception would always have a `wrapped` attribute, which
isn't necessarily the case if the exception was raised outside of the
job execution code.

app/jobs/regular/user_email.rb

@@ -8,6 +8,7 @@ module Jobs
     sidekiq_options queue: "low"
 
     sidekiq_retry_in do |count, exception|
+      next if exception.wrapped.nil?
       # retry in an hour when SMTP server is busy
       # or use default sidekiq retry formula. returning
       # nil/0 will trigger the default sidekiq

lib/sidekiq/suppress_user_email_errors.rb

@@ -6,7 +6,7 @@ module Sidekiq
       yield
     rescue => e
       # Only suppress email errors from Jobs::UserEmail, and only for the first 3 retries
-      if worker.class == Jobs::UserEmail && job["retry_count"] < 3
+      if worker.class == Jobs::UserEmail && !job["retry_count"].nil? && job["retry_count"] < 3
         raise Jobs::HandledExceptionWrapper.new(e)
       end
 

spec/lib/sidekiq/suppress_user_email_errors_spec.rb

@@ -33,6 +33,16 @@ RSpec.describe Sidekiq::SuppressUserEmailErrors do
           end
         end
       end
+
+      context "when retry_count is nil" do
+        it "does not wrap the exception, allowing normal error logging" do
+          job = { "class" => "Jobs::UserEmail", "retry_count" => nil }
+
+          expect do
+            middleware.call(worker, job, queue) { raise StandardError, "Email send failed" }
+          end.to raise_error(StandardError, "Email send failed")
+        end
+      end
     end
 
     context "with non-UserEmail jobs" do