Check for directory

src/freedombone-app-ghost

 }
 
 function upgrade_ghost {
+    if [ ! -d /var/www/$GHOST_DOMAIN_NAME/htdocs ]; then
+        return
+    fi
+
     if ! grep -q "ghost version:" $COMPLETION_FILE; then
         CURR_GHOST_VERSION=${GHOST_VERSION}b
     else