Fix wo-update motd

wo/cli/plugins/stack_pref.py

@@ -1470,10 +1470,15 @@ def pre_stack(self):
                 'root      soft    nofile      500000\n')
     # custom motd-news
     data = dict()
+    # check if update-motd.d directory exist
     if os.path.isdir('/etc/update-motd.d/'):
         if not os.path.isfile('/etc/update-motd.d/98-wo-update'):
+            # render custom motd template
             WOTemplate.deploy(
                 self, '/etc/update-motd.d/98-wo-update',
                 'wo-update.mustache', data)
         WOFileUtils.chmod(
             self, "/etc/update-motd.d/98-wo-update", 0o755)
+        # restart motd-news service if available
+        if os.path.isfile('/lib/systemd/system/motd-news.service'):
+            WOService.restart_service(self, 'motd-news')

wo/cli/templates/wo-update.mustache

@@ -17,10 +17,10 @@ ERR=$(mktemp) || exit 1
 CLOUD=$(mktemp) || exit 1
 trap "rm -f $NEWS $ERR $CLOUD" HUP INT QUIT ILL TRAP BUS TERM
 
-if [ -n "$(command -v curl > /dev/null 2>&1)" ]; then
+if [ -n "$(command -v curl)" ]; then
     LATEST_RELEASE=$(curl -m 5 --retry 3 -sI "$URL" | grep tag | awk -F "/" '{print $8}' 2>&1)
 fi
-if [ -n "$(command -v wo > /dev/null 2>&1)" ]; then
+if [ -n "$(command -v wo)" ]; then
     CURRENT_RELEASE=$(wo -v 2>&1 | grep v | awk -F " " '{print $2}')
 fi
 if [ -n "$CURRENT_RELEASE" ] && [ -n "$LATEST_RELEASE" ]; then