Fix early return in Faraday when Sentry is not initialized

sentry-ruby/lib/sentry/faraday.rb

@@ -29,7 +29,7 @@ class Instrumenter
       include Utils::HttpTracing
 
       def instrument(op_name, env, &block)
-        return unless Sentry.initialized?
+        return block.call unless Sentry.initialized?
 
         Sentry.with_child_span(op: op_name, start_timestamp: Sentry.utc_now.to_f, origin: SPAN_ORIGIN) do |sentry_span|
           request_info = extract_request_info(env)

sentry-ruby/spec/sentry/faraday_spec.rb

@@ -254,4 +254,26 @@
       expect(transaction.span_recorder.spans.map(&:origin)).not_to include("auto.http.faraday")
     end
   end
+
+  context "when Sentry is not initialized" do
+    let(:http) do
+      Faraday.new(url) do |f|
+        f.adapter Faraday::Adapter::Test do |stub|
+          stub.get("/test") do
+            [200, { "Content-Type" => "text/html" }, "<h1>hello world</h1>"]
+          end
+        end
+      end
+    end
+
+    let(:url) { "http://example.com" }
+
+    it "skips instrumentation" do
+      allow(Sentry).to receive(:initialized?).and_return(false)
+
+      response = http.get("/test")
+
+      expect(response.status).to eq(200)
+    end
+  end
 end