[FIX] Catch errors during learning in learner widgets #1949
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Issue
The base widget for learners did not intercept errors occurring during fitting.
Description of changes
Errors are now caught and a basic message that something went wrong is displayed. Widgets can provide more specific error messages when possible.
Some widgets tested
self.valid_data
to verify that fitting succeeded. This did not really work. Although it now would, the tests are replaced to check whetherself.model
is notNone
. This is more appropriate since the data may be valid when the model is not.A minor fix needed for tests:
Model
checked whether thedomain
parameter is given by checkingif domain
. This is wrong sinceDomain
does not have__bool__
, so__len__
is used instead, and soDomain([])
is treated asFalse
.Includes