Merge branch 'feature/fix-missing-return-statements' into 'master'

Ansgar Burchardtrequested to merge
cherry-pick-b5e12845 into releases/2.5

Add missing return statements

This avoids undefined behaviour. However, I have no idea, if 0 is a proper value to return.

Closes #14 (closed)

See merge request !29 (merged)

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