[1.7.x] Fixed #22161 -- Documented send() with no recipients won't raise an exception.
[1.7.x] Fixed #22161 -- Documented send() with no recipients won't raise an exception.

Backport of 0f0a5c07f9 from master

jyotsna1820/django,oscaro/django,oscaro/django,jyotsna1820/django,oscaro/django,oscaro/django,jyotsna1820/django,jyotsna1820/django