Pack doesn't send/load at all if send-delay is set to 0
Version 1.12.13
#### What is happening?
When send-delay is set to 0, the pack is not sent to the player at all.
#### What did you expect to happen?
If possible it would be nice to have the option of sending the pack without any delay.
#### Additional context
Even with a send-delay of just one tick, having the delay causes the world without the pack to be shown before the pack loads, which can be a bit jarring. If possible, having the pack sent/load without any delay would result in a more seemless transition when logging in and loading a resource pack.
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