Apply fix from @ahegyi

Checks if the project id param is available

ee/app/controllers/analytics/cycle_analytics/summary_controller.rb

@@ -21,11 +21,9 @@ module Analytics
       private
 
       def group_params
-        {
-          created_after: request_params.created_after,
-          created_before: request_params.created_before,
-          project_ids: request_params.project_ids
-        }
+        hash = { created_after: request_params.created_after, created_before: request_params.created_before }
+        hash[:project_ids] = request_params.project_ids if request_params.project_ids.any?
+        hash
       end
 
       def validate_params

ee/spec/controllers/analytics/cycle_analytics/summary_controller_spec.rb

@@ -25,6 +25,24 @@ describe Analytics::CycleAnalytics::SummaryController do
       expect(response).to match_response_schema('analytics/cycle_analytics/summary', dir: 'ee')
     end
 
+    it 'omits `projects` parameter if it is not given' do
+      expect(CycleAnalytics::GroupLevel).to receive(:new).with(group: group, options: hash_excluding(:projects)).and_call_original
+
+      subject
+
+      expect(response).to be_successful
+    end
+
+    it 'contains `projects` parameter' do
+      params[:project_ids] = [-1]
+
+      expect(CycleAnalytics::GroupLevel).to receive(:new).with(group: group, options: hash_including(:projects)).and_call_original
+
+      subject
+
+      expect(response).to be_successful
+    end
+
     include_examples 'cycle analytics data endpoint examples'
     include_examples 'group permission check on the controller level'
   end

ee/spec/frontend/fixtures/analytics.rb

@@ -180,6 +180,8 @@ describe 'Analytics (JavaScript fixtures)', :sidekiq_inline do
       stub_feature_flags(Gitlab::Analytics::CYCLE_ANALYTICS_FEATURE_FLAG => true)
       stub_licensed_features(cycle_analytics_for_groups: true)
 
+      prepare_cycle_analytics_data
+
       sign_in(user)
     end