Guard Compliance CI evaluation against blank path

This change ensures the Compliance CI template is not evaluated if the
compliance pipeline configuration location is blank (i.e. nil and empty
string).

Changelog: fixed
EE: true

ee/lib/gitlab/ci/pipeline/chain/config/content/compliance.rb

@@ -10,7 +10,7 @@ module Gitlab
               def content
                 strong_memoize(:content) do
                   next unless available?
-                  next unless pipeline_configuration_full_path
+                  next unless pipeline_configuration_full_path.present?
 
                   path_file, path_project = pipeline_configuration_full_path.split('@', 2)
                   YAML.dump('include' => [{ 'project' => path_project, 'file' => path_file }])

ee/spec/lib/gitlab/ci/pipeline/chain/config/content_spec.rb

@@ -8,9 +8,6 @@ RSpec.describe ::Gitlab::Ci::Pipeline::Chain::Config::Content do
   let(:content) { nil }
   let(:source) { :push }
   let(:command) { Gitlab::Ci::Pipeline::Chain::Command.new(project: project, content: content, source: source) }
-
-  subject { described_class.new(pipeline, command) }
-
   let(:content_result) do
     <<~EOY
     ---
@@ -20,6 +17,8 @@ RSpec.describe ::Gitlab::Ci::Pipeline::Chain::Config::Content do
     EOY
   end
 
+  subject { described_class.new(pipeline, command) }
+
   shared_examples 'does not include compliance pipeline configuration content' do
     it do
       subject.perform!
@@ -30,26 +29,56 @@ RSpec.describe ::Gitlab::Ci::Pipeline::Chain::Config::Content do
     end
   end
 
-  context 'when project has compliance pipeline configuration defined' do
+  context 'when project has compliance label defined' do
     let(:project) { create(:project, ci_config_path: ci_config_path) }
     let(:compliance_group) { create(:group, :private, name: "compliance") }
     let(:compliance_project) { create(:project, namespace: compliance_group, name: "hippa") }
 
-    let(:framework) { create(:compliance_framework, namespace_id: compliance_group.id, pipeline_configuration_full_path: ".compliance-gitlab-ci.yml@compliance/hippa") }
-    let!(:framework_project_setting) { create(:compliance_framework_project_setting, project: project, framework_id: framework.id) }
-
     context 'when feature is available' do
       before do
         stub_feature_flags(ff_evaluate_group_level_compliance_pipeline: true)
         stub_licensed_features(evaluate_group_level_compliance_pipeline: true)
       end
 
-      it 'includes compliance pipeline configuration content' do
-        subject.perform!
+      context 'when compliance pipeline configuration is defined' do
+        let(:framework) do
+          create(:compliance_framework,
+                 namespace: compliance_group,
+                 pipeline_configuration_full_path: ".compliance-gitlab-ci.yml@compliance/hippa")
+        end
+
+        let!(:framework_project_setting) do
+          create(:compliance_framework_project_setting, project: project, compliance_management_framework: framework)
+        end
 
-        expect(pipeline.config_source).to eq 'compliance_source'
-        expect(pipeline.pipeline_config.content).to eq(content_result)
-        expect(command.config_content).to eq(content_result)
+        it 'includes compliance pipeline configuration content' do
+          subject.perform!
+
+          expect(pipeline.config_source).to eq 'compliance_source'
+          expect(pipeline.pipeline_config.content).to eq(content_result)
+          expect(command.config_content).to eq(content_result)
+        end
+      end
+
+      context 'when compliance pipeline configuration is not defined' do
+        let(:framework) { create(:compliance_framework, namespace: compliance_group) }
+        let!(:framework_project_setting) do
+          create(:compliance_framework_project_setting, project: project, compliance_management_framework: framework)
+        end
+
+        it_behaves_like 'does not include compliance pipeline configuration content'
+      end
+
+      context 'when compliance pipeline configuration is empty' do
+        let(:framework) do
+          create(:compliance_framework, namespace: compliance_group, pipeline_configuration_full_path: '')
+        end
+
+        let!(:framework_project_setting) do
+          create(:compliance_framework_project_setting, project: project, compliance_management_framework: framework)
+        end
+
+        it_behaves_like 'does not include compliance pipeline configuration content'
       end
     end