Corpus pruning: do not fail the task if quarantine or shared corpus failed to sync (#462). (#508)
Corpus pruning: do not fail the task if quarantine or shared corpus failed to sync (#462). (#508)

* Corpus pruning: do not fail the task if quarantine or shared corpus failed to sync (#462).

* Add fuzz_target=self.fuzz_target as per review comment.

* Format.

google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz