odb export: subsitute empty pad name with UUID #1704

Job	Run time
stylecheck	27s
build-pr-review	3m 25s
build-opensuse (all)	11m 31s
build-opensuse (horizon.so)	3m 47s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 19s
build (ubuntu:focal, g++, gcc, all)	14m 24s
build (debian:bookworm, clang, clang, all)	14m 7s
build (debian:bookworm, clang, clang, horizon.so)	4m 31s
build (ubuntu:noble, g++, gcc, all)	12m 3s
build (debian:trixie, g++, gcc, horizon.so)	4m 27s
build (ubuntu:noble, g++, gcc, horizon.so)	4m 11s
build (ubuntu:jammy, g++, gcc, all)	12m 3s
build (ubuntu:plucky, g++, gcc, all)	12m 42s
build (debian:bullseye, g++, gcc, horizon.so)	4m 6s
build-arch (all)	13m 48s
build (ubuntu:plucky, g++, gcc, horizon.so)	4m 49s
build-debug	14m 6s
build (ubuntu:focal, g++, gcc, horizon.so)	6m 16s
build (debian:trixie, g++, gcc, all)	12m 24s
build (debian:bullseye, g++, gcc, all)	11m 19s
build (debian:bookworm, g++, gcc, all)	14m 12s
build-arch (horizon.so)	4m 13s
build (debian:bookworm, g++, gcc, horizon.so)	4m 25s
	3h 11m 35s

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