Simplify returned value when chunked reader is asked to read empty range

[robert3005]

This was a little bit too complex given what we were trying to do

Signed-off-by: Robert Kruszewski github@robertk.io

[codspeed-hq]

Merging this PR will improve performance by 18.36%

⚡ 4 improved benchmarks
✅ 1005 untouched benchmarks
⏩ 1515 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	old_bp_prim_test_between[i64, 16384]	326.2 µs	294.4 µs	+10.8%
⚡	Simulation	old_bp_prim_test_between[i64, 32768]	538.7 µs	475.5 µs	+13.29%
⚡	Simulation	bitwise_not_vortex_buffer_mut[1024]	535.6 ns	477.2 ns	+12.22%
⚡	Simulation	bitwise_not_vortex_buffer_mut[128]	376.1 ns	317.8 ns	+18.36%

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_{Comparing rk/simplifychunkedemptylayout (7bca01d) with develop (6d6faf3)}

Footnotes

1. 1515 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩