Fix misleading error message when it is not possible to create area weights requested from `cf.Field.collapse` #656

	name: Linting

	on:
	push:
	branches:
	- main
	pull_request:
	# default (from docs) is just on [opened, synchronize, reopened]
	types: [opened, reopened, ready_for_review, edited]
	branches:
	- main

	# Note: only running this on Ubuntu (latest) and Python 3.8 as representative,
	# since the linting output should be machine dependent and not vary much if
	# at all by Python minor version.

	jobs:
	# Lint against selected pre-commit hooks (see https://pre-commit.com
	# and https://github.com/pre-commit/action).
	# The config. applied here is from our .pre-commit-config.yaml
	#
	# Note the pre-commit linting includes all of the other linters configured
	# to run as pre-commit hooks, namely black, flake8 and docformatter etc.,
	# so there is no need to set these up individually!
	pre-commit:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v4
	- uses: pre-commit/action@v3.0.0

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