virtme-ng: Don't fail on missing argcomplete

The argcomplete dependency isn't critical, so let's continue on in its
absence instead of blowing up (convenient for running the 'vng'
command directly from the source tree without having to install any
python module dependencies).

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>

virtme_ng/run.py

@@ -20,7 +20,12 @@
 )
 from select import select
 from pathlib import Path
-from argcomplete import autocomplete
+try:
+    from argcomplete import autocomplete
+except ModuleNotFoundError:
+    def autocomplete(*args, **kwargs):
+        # pylint: disable=unused-argument
+        pass
 
 from virtme.util import SilentError, get_username
 from virtme_ng.utils import CONF_FILE