Remove redundant check

app/services/spam/spam_verdict_service.rb

@@ -50,10 +50,7 @@ module Spam
         # @TODO metrics/logging
         # Expecting:
         # error: (string or nil)
-        # result: (string or nil)
-        verdict = json_result[:verdict]
-        return unless SUPPORTED_VERDICTS.include?(verdict)
-
+        # verdict: (string or nil)
         # @TODO log if json_result[:error]
 
         json_result[:verdict]

spec/services/spam/spam_verdict_service_spec.rb

@@ -192,8 +192,8 @@ describe Spam::SpamVerdictService do
         context 'the verdict is an unexpected string' do
           let(:verdict) { 'this is fine' }
 
-          it 'returns nil' do
-            expect(subject).to be_nil
+          it 'returns the string' do
+            expect(subject).to eq verdict
           end
         end
 
@@ -209,7 +209,7 @@ describe Spam::SpamVerdictService do
           let(:verdict) { '' }
 
           it 'returns nil' do
-            expect(subject).to be_nil
+            expect(subject).to eq verdict
           end
         end