[processing] fix GRASS v.buffer algorithm for variable buffer case (fix #19377) #8973
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Description
GRASS v.buffer failed when using with "Name of column to use for buffer distances" parameter. This PR adds missed bits to make it work correctly. Fixes https://issues.qgis.org/issues/19377.
Although this adds a new parameter, it is optional and should not break existing models/scripts.
Checklist
fixes #11111
in the commit message next to the description[FEATURE]
in the commit message[needs-docs]
in the commit message and contain sufficient information in the commit message to be documentedscripts/prepare-commit.sh
script before each commit