[pgAdmin][RM7405] Update null in numeric columns not possible

[Aditya Toshniwal]

Hi Hackers,

Attached is the patch to fix the issue.
Please review.

-- 
Thanks,
Aditya Toshniwal
pgAdmin Hacker | Software Architect | *edbpostgres.com*
<http://edbpostgres.com>
"Don't Complain about Heat, Plant a TREE"

RM7405.patch
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