Merge pull request #3 from Mastercard/feature/fix_multiple_encryption_paths

Fixed NPE when multiple encryption paths are provided

Author: ech0s7r

lib/mcapi/encryption/field_level_encryption.rb

@@ -81,13 +81,15 @@ def decrypt(response)
 
       def encrypt_with_body(path, body)
         elem = elem_from_path(path['element'], body)
+        return unless elem && elem[:node]
         encrypted_data = @crypto.encrypt_data(data: JSON.generate(elem[:node]))
         McAPI::Utils.mutate_obj_prop(path['obj'], encrypted_data, body)
         McAPI::Utils.delete_node(path['element'], body) if path['element'] != "#{path['obj']}.#{@config['encryptedValueFieldName']}"
       end
 
       def encrypt_with_header(path, enc_params, header, body)
         elem = elem_from_path(path['element'], body)
+        return unless elem && elem[:node]
         encrypted_data = @crypto.encrypt_data(data: JSON.generate(elem[:node]), encryption_params: enc_params)
         body = { path['obj'] => { @config['encryptedValueFieldName'] => encrypted_data[@config['encryptedValueFieldName']] } }
         set_header(header, enc_params)