Flow conditions validation shows bad error message when tasks are not connected.

[lbradstreet]

Task :in-task is not connected to :response-out in the workflow, and this error message is very bad as it is a valid task name, though it is not connected.

------ Onyx Job Error -----
There was a validation error in your flow-conditions for key :flow/to
{
   :flow/predicate :compute.command-processor.tasks.common/response?
   :flow/short-circuit? false
   :flow/from :in-task
   :flow/to [:response-out]
    ^-- [:response-out] isn't a valid task name.
}
Did you mean: :response-out
------

[lbradstreet]

Non-schema based validation code can be found here:

https://github.com/onyx-platform/onyx/blob/0.12.x/src/onyx/static/validation.cljc

[lbradstreet]

We should improve the error message to say that the tasks are disconnected, rather than tell the user that it isn't a valid task name (and then list that task anyway!).

[lbradstreet]

Closed thanks to #859.