added logging

gentooimgr/qemu.py

@@ -45,9 +45,9 @@ def run_image(
         )
 
     if isinstance(iso, list):
+        assert len(iso), f"iso list is empty {iso}"
         iso = iso[0]
 
-
     image = gentooimgr.common.get_image_name(args, config)
     qmounts = []
     mounts.extend(args.mounts)