f105c1766e
since 'pvesm export' and 'pvesm import' are connected via a pipe and SSH, a fatal error in the former can lead to no valid header being written to the pipe. handle this more gracefully by printing an easier to understand error message, instead of uninitialized warnings with no context. Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>