Fixes for: NCHK-2653 - Crash when javascript entry is missing from the zip
NCHK-2638 ePubCheck throws scripting errors, but no items are marked as isScripted=True
NCHK-2633 ePub2s are throwing SCP errors but not also throwing an SCP-004 error
Merge pull request #359 from IDPF/p/santoch/cr/scriptIssues

P/santoch/cr/script issues