Grass algorithm outputs do not correctly work within models

[qgib]

Author Name: Alister Hood (@AlisterH)
Original Redmine Issue: 18095
Affected QGIS version: master
Redmine category:processing/grass
Assignee: Victor Olaya

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"Extract layer extent" does not work in processing model in master if input layer is also a "final result".
The attached model is a simple test case. Try changing it so the output of v.to.rast is not a "final result", and everything will work!

Prepare algorithm: qgis:polygonfromlayerextent_2
Running Extract layer extent [2/2]
Input Parameters:
{ INPUT: , OUTPUT: 'memory:' }
Traceback (most recent call last): File "/usr/share/qgis/python/plugins/processing/algs/qgis/ExtentFromLayer.py", line 96, in processAlgorithm fields, QgsWkbTypes.Polygon, layer.crs()) AttributeError: 'NoneType' object has no attribute 'crs' 

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• model.model3 (Alister Hood)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Specific to GRASS algorithms only.

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• category_id was changed from Processing/QGIS to Processing/GRASS
• subject was changed from "Extract layer extent" does not work in processing model in QGIS 3 if input layer is also a "final result" to Grass algorithm outputs do not correctly work within models

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Fixed in 3.3

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