where configuration is silently ignored when using QueryBuilder

[Helveg]

Is there a particular reason why we disable applying the andWhere to the query builder when the original repo argument was not a repository?

    if (config.where && repo instanceof Repository) {
        const baseWhereStr = generateWhereStatement(queryBuilder, config.where)
        queryBuilder.andWhere(`(${baseWhereStr})`)
    }

This bit me in the ass today as my where configuration was silently ignored. We should either apply it, or raise an error when it is given together with a query builder argument.

[Helveg]

@ppetzold ping? If you let me know how you'd like to proceed I can PR it.