Add test to check if $contentType is defnie or null.
Add test to check if $contentType is defnie or null.

This correct allow to use upload function which required a content type.

Signed-off-by: fchambos <14a3060a7f928dd0ee6c6e0f3f9b6599f6219a1c@groupe-regards.com>

samsonasik/zend-stdlib