Invalid cron doesn't return right error message

[darkchilli]

Digdag v0.9.31
Issue: When pushing to digdag server from digdag-client, not returning helpful error message.

--- Dig file ---

schedule:
cron>: 1 4,8,12,16,20
...
...

--- digdag push ---
digdag push corporate -e xx.xx.xx.xx:65432
2018-11-26 10:53:46 +1100: Digdag v0.9.31
Creating .digdag/tmp/archive-8215978397101272324.tar.gz...
Archiving xxxxxxx.dig
Workflows:
xxxxxxx.dig
error: HTTP 500 Internal Server Error (internal server error)

--- Expect ---
Invalid cron error should be returned to client, at the moment it seems to be only available on digdag server side.
Digdag server log:
Caused by: it.sauronsoftware.cron4j.InvalidPatternException: invalid pattern: "1 4,8,12,16,20"

[hiroyuki-sato]

Hello, @darkchilli

Thank you for reporting the issue.
I think It is better to report the right message when invalid format pushed.

Could you try cron>: 1 4,8,12,16,20 * * *?

[yoyama]

I will close it, because #1026 may solve this issue. If you still have the issue feel free to reopen.