ext/pdo: Fix various PDORow bugs

- Add tests
- NULL derefencing in read_dimension handler
- Fix isset()
- Fix empty() with column numbers as offsets
- Refactoring to use comm

ext/pdo: Fix various PDORow bugs

- Add tests
- NULL derefencing in read_dimension handler
- Fix isset()
- Fix empty() with column numbers as offsets
- Refactoring to use common functions

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