Processing/GRASS: Better handlig missing error layer

[qgib]

Author Name: Paolo Cavallini (@pcav)
Original Redmine Issue: 10702
Affected QGIS version: 2.2.0
Redmine category:processing/grass
Assignee: Victor Olaya

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The module v.clean by default is asked to load the error layer. In case the analysis ends up without errors, the layer is not created, and the user is presented with a scary and difficult to understand message.
This should be handled more gracefully, e.g. with a message "No errors found - no error layer produced".

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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• category_id was changed from 94 to Processing/GRASS

[qgib]

Author Name: Giovanni Manghi (@gioman)

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the error of Processing error message have been improved recently. Moreover with v.clean in GRASS7 it seems that the error layer is always produced (is empty if there are no errors).

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• resolution was changed from to fixed/implemented
• status_id was changed from Open to Closed