init: fix missing errors if logs didn't initialize (!1755)

Set the log level to DEBUG if args (and therefore logging) failed to
initialize. This causes the default logging handler to be used, and
everything that gets written to the log (error message and trace!) will
get printed to stdout instead of not being printed anywhere at all.

This can be tested by removing x86_64 from the mapping in
pmb.parse.arch.alpine_native() (assuming the host is x86_64). Without
this patch, no meaningful error appears. With the patch, the real error
message, and a stack trace gets printed.

pmb/__init__.py

@@ -71,6 +71,10 @@ def main():
         logging.info("Done")
 
     except Exception as e:
+        # Dump log to stdout when args (and therefore logging) init failed
+        if not args:
+            logging.getLogger().setLevel(logging.DEBUG)
+
         logging.info("ERROR: " + str(e))
         logging.info("See also: <https://postmarketos.org/troubleshooting>")
         logging.debug(traceback.format_exc())