Fix specs and improve code readability

lib/mattermost/presenter.rb

@@ -30,9 +30,9 @@ module Mattermost
         if subject.is_a?(Gitlab::ChatCommands::Result)
           show_result(subject)
         elsif subject.respond_to?(:count)
-          if subject.try(:many?)
+          if subject.many?
             multiple_resources(subject)
-          elsif subject.count == 0
+          elsif subject.none?
             not_found
           else
             single_resource(subject)

spec/lib/gitlab/chat_commands/deploy_spec.rb

@@ -52,12 +52,13 @@ describe Gitlab::ChatCommands::Deploy, service: true do
 
         context 'when teardown action exists' do
           let!(:teardown) do
-            create(:ci_build, :manual, :teardown_environment, project: project, pipeline: build.pipeline,
+            create(:ci_build, :manual, :teardown_environment,
+                   project: project, pipeline: build.pipeline,
                    name: 'teardown', environment: 'production')
           end
 
           it 'returns error' do
-            expect(subject).to eq(action)
+            expect(subject).to eq(manual1)
           end
         end
       end