See https://issues.apache.org/jira/secure/ReleaseNote.jspa?version=12349957&styleName=&projectId=12310481&Create=Create&atl_token=A5KQ-2QAV-T4JA-FDED_7e59644a960cdc1863911db6c7ebfc2eecfff2f3_lin
XWIKI-21197 Bad XAR entries should be skipped