Parent of subcategories is not exported with CSV export

[tlnd]

Data exported via the "CSV Export" does not include information about the parent of subcategories. Even though a 'parent' field is defined in the header, its content is always empty ("") for both first-level categories as well as subcategories.

[tlnd (tlnd)]

The data to be exported is provided by db.DatabaseAdapter.getAllCategoriesMap(), which gathers the categories from the database and creates according objects. However, the database does not include direct information about a parent of a category, thus the parent field is always null.
The required information about the hierarchy of the categories can be extracted from the left/right properties of a category, like done in getAllCategoriesTree() via CategoryTree.createFromCursor(). This mechanism obviously needs to be adopted.