Add logic to check for existence of files before interacting with them

if ${rcvar} or ${rcvar}.new don't exist, we can't rm/mv them.

conf/type/__pf_ruleset/gencode-remote

@@ -36,6 +36,6 @@ fi
 rcvar=$(cat "$__object/explorer/rcvar")
 
 # --state absent, so ensure that .new doesn't exist and that conf is renamed to .old
-echo rm \"${rcvar}.new\"
-echo mv \"${rcvar}\" \"${rcvar}.old\"
+echo "[ -f \"${rcvar}.new\" ] && rm \"${rcvar}.new\""
+echo "[ -f \"${rcvar}\" ] && mv \"${rcvar}\" \"${rcvar}.old\""