Hi,
If you got a blank page, please change the "PHP error reporting" level in your Joomla global configuration.
At this moment you will see the PHP error messages instead of a blank page. It will give more more details to debug your plugin.
About your main problem, You totally can have some carriage return in a CSV file without any problem.
HikaShop use the CSV rules with quotes to have some delimiter between values.
If you open your CSV file correctly, saying that only the coma is the separator, your CSV file will be open nice.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.