Bug 16256 - Can't edit library EAN if you leave EAN empty

Bug 16256 - Can't edit library EAN if you leave EAN empty

Test Plan:
1) Create an empty EAN
2) Edit it and save
3) Note you get a new EAN row
4) Apply this patch
5) Edit the empty EAN again
6) Note you now get an updated EAN and not a new row

Signed-off-by: Chris Cormack <chrisc@catalyst.net.z>
Depends on bug 16208 (which depends on 16206)

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan Gallagher <bredan@bywatersolutions.com>