unary operator expected

[pothi]

Debug output...

+ DEFAULT_SITE=delta9seattle.org
+ BACKUP_PATH=/home/delta9seattle_sftp/Backup/databases/
+ '[' == '' ']'
./db-backup.sh: line 15: [: ==: unary operator expected
+ SITE_NAME=
+ '[' -f /home/delta9seattle_sftp/sites//wp-config.php ']'
+ WP_CONFIG_PATH=/home/delta9seattle_sftp/sites//wordpress/wp-config.php
++ sed 's/[()'\'',;]/ /g' /home/delta9seattle_sftp/sites//wordpress/wp-config.php
++ awk '{print $3}'
sed: can't read /home/delta9seattle_sftp/sites//wordpress/wp-config.php: No such file or directory
++ grep DB_PASSWORD
+ WPPASS=
++ sed 's/[()'\'',;]/ /g' /home/delta9seattle_sftp/sites//wordpress/wp-config.php
++ awk '{print $3}'
sed: can't read /home/delta9seattle_sftp/sites//wordpress/wp-config.php: No such file or directory
++ grep DB_USER
+ WPUSER=
++ sed 's/[()'\'',;]/ /g' /home/delta9seattle_sftp/sites//wordpress/wp-config.php
++ awk '{print $3}'
sed: can't read /home/delta9seattle_sftp/sites//wordpress/wp-config.php: No such file or directory
++ grep DB_NAME
+ WPDB=
+ mysqldump --add-drop-table -u -p
+ gzip
++ date +%F_%H-%M-%S