chore: add missing is empty check

[mattsse]

No description provided.

[codecov]

Codecov Report

Merging #4565 (187b74f) into main (25558b3) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

Files Changed	Coverage Δ
crates/transaction-pool/src/pool/mod.rs	50.96% <0.00%> (-0.30%)	⬇️

... and 11 files with indirect coverage changes

Flag	Coverage Δ
integration-tests	16.62% <0.00%> (-0.02%)	⬇️
unit-tests	63.93% <0.00%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
reth binary	30.83% <ø> (ø)
blockchain tree	83.58% <ø> (ø)
pipeline	90.53% <ø> (ø)
storage (db)	75.32% <ø> (ø)
trie	94.88% <ø> (ø)
txpool	47.26% <0.00%> (-0.54%)	⬇️
networking	77.16% <ø> (-0.12%)	⬇️
rpc	57.35% <ø> (-0.01%)	⬇️
consensus	63.40% <ø> (ø)
revm	31.56% <ø> (ø)
payload builder	6.34% <ø> (ø)
primitives	86.51% <ø> (-0.03%)	⬇️

[shekhirin]

LGTM. IIUC this path is possible either if all transactions to propagate were EIP-4844 or they were already seen by all peers. We're saving on RwLock::write in these cases.