Check for Roundcube before changing backend port

Adds condition to check for Roundcube installation prior to changing backend port for database driver; without this sed throws an error during clean installation and when running the script manually.

Author: kristan-kenney

bin/v-change-sys-port

@@ -72,7 +72,9 @@ if [ "$ORIGINAL_PORT" = "$PORT" ]; then
 else
     # Replace port in config files.
     sed -i "/listen/c\        listen          $PORT ssl;" $HESTIA/nginx/conf/nginx.conf
-    sed -i "/password_hestia_port/c\$rcmail_config['password_hestia_port'] = '$PORT';" /etc/roundcube/plugins/password/config.inc.php
+    if [ -d /etc/roundcube/ ]; then
+        sed -i "/password_hestia_port/c\$rcmail_config['password_hestia_port'] = '$PORT';" /etc/roundcube/plugins/password/config.inc.php
+    fi
     sed -i "/COMMENT='HESTIA'/c\RULE='2' ACTION='ACCEPT' PROTOCOL='TCP' PORT='$PORT' IP='0.0.0.0/0' COMMENT='HESTIA' SUSPENDED='no' TIME='07:40:16' DATE='2014-05-25'" $HESTIA/data/firewall/rules.conf
 
     # Restart services