Check for metadata that are missing altogether
Check for metadata that are missing altogether

Fixes the second stack trace in TOOLS-82

gholms/euca2ools,nagyistoce/euca2ools,jhajek/euca2ools,nagyistoce/euca2ools,gholms/euca2ools,jhajek/euca2ools,vasiliykochergin/euca2ools,vasiliykochergin/euca2ools