Add exception hanlding for 'Chef::Exceptions::ValidationFailed'. This…

… exception is thrown if data bag is not found.

Chef does do good job of handling absence of data bag (or data bag item)

libraries/chef_nexus.rb

@@ -220,6 +220,12 @@ def encrypted_data_bag_item(node, data_bag, data_bag_item)
           Mash.from_hash(item.to_hash)
         rescue Net::HTTPServerException => e
           nil
+
+        # chef_data_bag_item.rb fails to handle scenario of missing data bag :-(,
+        # it reports this as Chef::Exceptions::ValidationFailed exception.
+        # Adding a different rescue block if things exception needs to be handled differently
+        rescue Chef::Exceptions::ValidationFailed => e
+          nil
         end
     end
   end