Check files in nbroles to grains script

Script is called in the Lysergic repository as well, where not all files
exist.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

bin/nbroles_to_grains.sh

@@ -1,4 +1,14 @@
 #!/usr/bin/env sh
 # This rewrites top-files to fetch roles from grains instead of our custom roles API. Useful for testing outside of the LibertaCasa infrastructure, but not recommended for production.
 
-sed -i "s/salt\['http.query'\].*/grains\['roles'\] -%}/" */top.sls salt/common/suse.sls
+potential_files=(*/top.sls salt/common/suse.sls)
+
+for file in ${potential_files[@]}
+do
+	if [ -f "$file" ]
+	then
+		files+="$file "
+	fi
+done
+
+sed -i "s/salt\['http.query'\].*/grains\['roles'\] -%}/" ${files[@]}