QEMU: Some corpus backups being generated. No coverage reports generated at all

[a1xndr]

For projects/qemu , CORPUS backups are being generated (but only for some targets):
https://console.cloud.google.com/storage/browser/qemu-backup.clusterfuzz-external.appspot.com/corpus/libFuzzer/qemu_qemu-fuzz-i386-target-generic-fuzz-virtio-vga

However, no coverage reports are being generated, at all. The unzip fails for every single target. It seems this code should succeed even if only some of the corpus backups are being created

oss-fuzz/infra/helper.py

Line 1093 in 26f36ff

def _get_latest_corpus(project, fuzz_target, base_corpus_dir):

Local merge/coverage generation succeeds