read: fix parse for empty DWP index #433

Job	Run time
coverage	1m 6s
bench	1m 22s
build (ubuntu-latest, stable)	52s
Build fuzz targets	1m 13s
build (ubuntu-latest, beta)	52s
cross (i686-unknown-linux-gnu)	56s
doc	29s
build (ubuntu-latest, nightly)	54s
cross (powerpc64-unknown-linux-gnu)	58s
build (ubuntu-latest, 1.65.0)	1m 57s
features	2m 59s
build (stable, macOS-latest)	2m 1s
msrv-read	1m 32s
rustfmt	11s
Run `debug_abbrev` fuzz target	5m 5s
Run `debug_aranges` fuzz target	5m 6s
Run `debug_info` fuzz target	5m 6s
Run `debug_line` fuzz target	5m 9s
Run `eh_frame` fuzz target	5m 7s
Run `eh_frame_hdr` fuzz target	5m 6s
	48m 1s

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