Steps to reproduce:

• send API call through JSON RPC

  {"jsonrpc":"2.0","method":"configuration.import","params":{"format":"xml","rules":{"groups":{"createMissing":true}},"source":"<?xml version=\"1.0\" encodin
  g=\"UTF-8\"?>\n\t\t\t\t\t\t\t\t<zabbix_export>\n\t\t\t\t\t\t\t\t<version>3.2<\/version>\n\t\t\t\t\t\t\t\t<date>2016-12-09T07:12:45Z<\/date>\n\t\t\t\t\t\t\t\t<groups>\n\t\t\t\t\t\
  t\t\t\t<group>\n\t\t\t\t\t\t\t\t\t\t<name>API host group xml import<\/name>\n\t\t\t\t\t\t\t\t\t<\/group>\n\t\t\t\t\t\t\t\t<\/groups>\n\t\t\t\t\t\t\t\t<\/zabbix_export>"},"id":0,"
  auth":"a98b931391ff96a10d7ec190ba7de5a6"}

Result:

Undefined index: type [api_jsonrpc.php:63 -> CJsonRpc->execute() -> CLocalApiClient->callMethod() -> call_user_func_array() -> CConfiguration->import() -> CConfigurat
ionImport->import() -> CConfigurationImport->processImages() -> CConfigFile->{closure}() in include/classes/import/CConfigurationImport.php:1638]