provide default implementation of template method and use safe navigation operator

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/license/management/versions/base.rb b/lib/license/management/versions/base.rb
index 6e30e20..2345a50 100644
--- a/lib/license/management/versions/base.rb
+++ b/lib/license/management/versions/base.rb
@@ -14,10 +14,15 @@ module License
           @repository = License::Management::Repository.new
         end
 
+        def to_h
+          raise NotImplementedError
+        end
+
         private
 
+
         def paths_from(dependency)
-          return [] unless dependency.respond_to?(:aggregate_paths)
+          return [] unless dependency&.respond_to?(:aggregate_paths)
 
           paths = dependency.aggregate_paths
           return [] if blank?(paths)