Only attempt to print if x is a suitable data.table

[jeffreyhorner]

Fixes #832 by only attempting to print suitable data.tables, e.g. those that satisfy class(unclass(x)) == 'list'.

[arunsrinivasan]

@jeffreyhorner nice fix. Looks great!
Could you change the error message to be slightly more informative?

Perhaps: "Internal structure doesn't seem to be a list. Possibly corrupt data.table." ?? or something similar?

[jeffreyhorner]

I'd be happy to but I won't be able to get to it until the end of next
week. Feel free modify it at will if you like.
On Oct 3, 2014 4:11 AM, "Arun" notifications@github.com wrote:

@jeffreyhorner https://github.com/jeffreyhorner nice fix. Looks great!
Could you change the error message to be slightly more informative?

Perhaps: "Internal structure doesn't seem to be a list. Possibly corrupt
data.table." ?? or something similar?

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