Spec for issues search

Library/Homebrew/test/utils/github_spec.rb

@@ -28,4 +28,12 @@ describe GitHub do
       expect(query).to eq("q=user%3AHomebrew+user%3Acaskroom&per_page=100")
     end
   end
+
+  describe "::issues_matching", :needs_network do
+    it "queries GitHub issues with the passed parameters" do
+      results = subject.issues_matching("brew search", repo: "Homebrew/brew", author: "avetamine", is: "closed")
+      expect(results.count).to eq(1)
+      expect(results.first["title"]).to eq("brew search : 422 Unprocessable Entity")
+    end
+  end
 end

Library/Homebrew/utils/github.rb

@@ -266,7 +266,7 @@ module GitHub
       puts "Closed pull requests:"
       prs = open_or_closed_prs
     else
-      return
+      return []
     end
 
     prs.each { |i| puts "#{i["title"]} (#{i["html_url"]})" }