Merging patch from smoser to add additional checks of user_data value.
Merging patch from smoser to add additional checks of user_data value.
vasiliykochergin/euca2ools,vasiliykochergin/euca2ools,jhajek/euca2ools,gholms/euca2ools,nagyistoce/euca2ools,jhajek/euca2ools,nagyistoce/euca2ools,gholms/euca2ools