Fixed issue with none initialized return value when setting wallbox mode to the current one

Fixed issue with none initialized return value

As reported in #212, it could happen, that the return value is not initialized. This seams to be a really old issue... occurring, when the current wallbox mode is already the same, that your are trying to set... Of course this should never be the case - but also of course the code should just do nothing in this situation... for sure should not cause an internal error ;-)

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