v3: SQL "NOT IN ()" never matches

Gemfile.lock

@@ -369,6 +369,3 @@ DEPENDENCIES
   travis-yaml!
   unicorn
   yard-sinatra!
-
-BUNDLED WITH
-   1.10.6

lib/travis/api/v3/queries/repositories.rb

@@ -24,7 +24,7 @@ module Travis::API::V3
       if user and not starred.nil?
         if bool(starred)
           list = list.joins(:stars).where(stars: { user_id: user.id })
-        else
+        elsif user.starred_repository_ids.any?
           list = list.where("repositories.id NOT IN (?)", user.starred_repository_ids)
         end
       end

spec/v3/services/repositories/for_current_user_spec.rb

@@ -128,6 +128,15 @@ describe Travis::API::V3::Services::Repositories::ForCurrentUser do
     before  { get("/v3/repos", {"starred" => "false"}, headers)                              }
     example { expect(last_response)                   .to be_ok                              }
     example { expect(JSON.load(body)['@href'])        .to be == "/v3/repos?starred=false"    }
-    example { expect(JSON.load(body)['repositories']) .to be == ["all the unstarred repos"]  }
+    example { expect(JSON.load(body)['repositories']) .not_to be_empty                       }
+  end
+
+  describe "filter: starred=false but no unstarred repos" do
+    before  { Travis::API::V3::Models::Star.create(user: repo.owner, repository: repo)       }
+    after   { repo.owner.stars.each(&:destroy)                                               }
+    before  { get("/v3/repos", {"starred" => "false"}, headers)                              }
+    example { expect(last_response)                   .to be_ok                              }
+    example { expect(JSON.load(body)['@href'])        .to be == "/v3/repos?starred=false"    }
+    example { expect(JSON.load(body)['repositories']) .to be_empty                           }
   end
 end