io_queue: Remove empty notifications #38

Job	Run time
Test with DPDK enabled / test	9m 44s
Test (clang++, C++20, dev) / test	1m 19s
Test with C++20 modules enabled / test	1m 58s
Test (clang++, C++20, debug) / test	20m 25s
Test (clang++, C++23, debug) / test	2m 2s
Test (clang++, C++20, release) / test	1m 37s
Test (clang++, C++23, dev) / test	7m 46s
Test (clang++, C++23, release) / test	1m 27s
Test (g++, C++20, debug) / test	23m 50s
Test (g++, C++20, release) / test	40m 8s
Test (g++, C++23, debug) / test	23m 43s
Test (g++, C++20, dev) / test	17m 7s
Test (g++, C++23, dev) / test	18m 0s
Test (g++, C++23, release) / test	22m 25s
	3h 11m 31s

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