Bug #13805 import numeric fields with missing data

Description:
Good evening,

I have a problem when importing numeric data with MySql. The database is managed thanks to PhpMyAdmin. I import the data from csv files. In the database, there are numerous numeric fields, with Null authorized and default value=Null. In the csv files, many of these numeric fields are often null (missing data). The problem is that when I import these csv files to the database, the numeric missing data are replaced by 0 instead of null. This problem is quite serious for us, as we can not distinguish a real 0 value from a missing data.

How can I solve this problem?
Tanhk you for your help.

How to repeat:

I think this problem isn't with the server and instead how the
data file was created. Please see:

http://dev.mysql.com/doc/mysql/en/problems-with-null.html

When reading data with LOAD DATA INFILE, empty or missing columns are updated with ''. If you want a NULL value in a column, you should use \N in the data file. The literal word “NULL” may also be used under some circumstances. See Section 13.2.5, “LOAD DATA INFILE Syntax”.

Thank you very much for your answer. I tried to replace '' with \N and the fields in the database were correctly replaced by Null values. Thank you again.