Fix potential nil pointer dereference when VM tags are empty (#4117)
Fix potential nil pointer dereference when VM tags are empty (#4117)


jackfrancis/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,Azure/acs-engine,Azure/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,Azure/acs-engine,jackfrancis/acs-engine,jackfrancis/acs-engine