Manage case of scan doesn't return any result

xymon/plugins/client/ext/smart

@@ -87,7 +87,7 @@ if test -f /tmp/dscan; then rm -f -- /tmp/dscan; fi
 smartctl --scan > /tmp/dscan
 
 # TODO: Test if the file is not empty
-
+if test -s /tmp/dscan; then
 	while IFS= read -r LINE; do
 		## Get device path
 		DISK=$(echo "${LINE}" | cut -d" " -f1)
@@ -138,6 +138,10 @@ while IFS= read -r LINE; do
 		} >>/tmp/dres
 	done < /tmp/dscan > /tmp/dcheck
 
+else
+	echo "1&red Error while scanning devices with smartctl" > /tmp/dcheck
+fi
+
 # Set the global color according to the highest alert
 COLOR=$(< /tmp/dcheck awk '{print $1}' | sort | uniq | head -1 | cut -c3-)