Fixed missing tools.json problem.

Merged Markus Scheidgen requested to merge fix-missing-tools-json into develop

The config cannot find the right default tools.json file when run from not the project root directly. This fix is trying to use the given file as it if, if fails uses the given file relative to the project root.

This is related to #1353.

Changlog: Fixed

Edited by Markus Scheidgen

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