add support for empty array of ingores

lib/bundler/audit/configuration.rb

@@ -68,15 +68,16 @@ def self.load(file_path)
         doc.root.children.each_slice(2) do |key,value|
           case key.value
           when 'ignore'
-            unless value.is_a?(YAML::Nodes::Sequence)
+            if value.is_a?(YAML::Nodes::Sequence)
+              unless value.children.all? { |node| node.is_a?(YAML::Nodes::Scalar) }
+                raise(InvalidConfigurationError,"'ignore' array in config file contains a non-String")
+              end
+              config[:ignore] = value.children.map(&:value)
+            elsif value.is_a?(YAML::Nodes::Mapping)
               raise(InvalidConfigurationError,"'ignore' key found in config file, but is not an Array")
+            else
+              config[:ignore] = []
             end
-
-            unless value.children.all? { |node| node.is_a?(YAML::Nodes::Scalar) }
-              raise(InvalidConfigurationError,"'ignore' array in config file contains a non-String")
-            end
-
-            config[:ignore] = value.children.map(&:value)
           end
         end
 

spec/configuration_spec.rb

@@ -45,6 +45,12 @@
           it { should be_a(described_class) }
         end
 
+        context 'when ignore contains and commented values' do
+          let(:path) { File.join(fixtures_dir,'ignore_contains_commented.yml')   }
+
+          it { should be_a(described_class) }
+        end
+
         describe "when ignore contains non-strings" do
           let(:path) { File.join(fixtures_dir,'bad','ignore_contains_a_non_string.yml') }
 

spec/fixtures/config/ignore_contains_commented.yml

@@ -0,0 +1,4 @@
+---
+ignore:
+#  - CVE-123
+#  - CVE-456