Only show "not supported by QEMU version" message if we determine that
to be the actual cause, just print the error otherwise.

Signed-off-by: Stefan Reiter <s.rei...@proxmox.com>
---
 PVE/VZDump/QemuServer.pm | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/PVE/VZDump/QemuServer.pm b/PVE/VZDump/QemuServer.pm
index 5a9ffab..4d171d2 100644
--- a/PVE/VZDump/QemuServer.pm
+++ b/PVE/VZDump/QemuServer.pm
@@ -490,9 +490,15 @@ sub archive_pbs {
        };
 
        my $qemu_support = eval { mon_cmd($vmid, "query-proxmox-support") };
-       if (!$qemu_support) {
-           die "PBS backups are not supported by the running QEMU version. 
Please make "
-             . "sure you've installed the latest version and the VM has been 
restarted.\n";
+       my $err = $@;
+       if (!$qemu_support || $err) {
+           die "query-proxmox-support returned empty value\n" if !$err;
+           if ($err =~ m/The command query-proxmox-support has not been 
found/) {
+               die "PBS backups are not supported by the running QEMU version. 
Please make "
+                 . "sure you've installed the latest version and the VM has 
been restarted.\n";
+           } else {
+               die "QMP command query-proxmox-support failed - $err\n";
+           }
        }
 
        my $fs_frozen = $self->qga_fs_freeze($task, $vmid);
-- 
2.20.1



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