Report server-side ETL errors to client

[thibaudh]

Generally, add meaningful error messages when API is misused (missing edges, nodes, source, etc)

Also ask user to upgrade pygraphistry when API version has changed

[lmeyerov]

@thibaudh can we close / split the issue?

[thibaudh]

Still not resolved since it is a day of work. Will become more pressing as users get frustrated...

On Aug 16, 2015, at 11:25 PM, lmeyerov notifications@github.com wrote:

@thibaudh https://github.com/thibaudh can we close / split the issue?

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[lmeyerov]

This has been there for awhile now, closing.