[dataimport] _create_copyfrom_buffer: raise ValueError if conversion cannot be performed If the conversion fails, there is no reason to continue execution. One should notify the error. Continuing after a misconverted data could corrupt the database. Related to #3845572

include *.py
include */*.py
recursive-include data *.gif *.png *.ico *.css *.js
recursive-include i18n *.po
recursive-include wdoc *