tasks: fix loading precedence

[jdx]

Fixes #1593

This also makes it possible to have tasks in directories without a config file.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.05%	✅ 88.37%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (adfcc0d)	16530	13908	84.14%
Head commit (4bb856b)	16545 (+15)	13913 (+5)	84.09% (-0.05%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1625)	86	76	88.37%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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