extensions/table.py: Not compatible with pytype

[schwehr]

pytype can't tell what type will come back from self.properties.get in extensions/table.py. I had to comment out the return type annotations to make it past pytype (to stop pytype from checking). pytype thinks self.properties.get returns Optional[Any].

    @property
    def primary_geometry(self):  # -> Optional[str]:
        """The primary geometry column name"""
        return self.properties.get(PRIMARY_GEOMETRY_PROP)

    @primary_geometry.setter
    def primary_geometry(self, v: Optional[str]) -> None:
        if v is None:
            self.properties.pop(PRIMARY_GEOMETRY_PROP, None)
        else:
            self.properties[PRIMARY_GEOMETRY_PROP] = v

    @property
    def row_count(self):  # -> Optional[int]:
        """The number of rows in the dataset"""
        return self.properties.get(ROW_COUNT_PROP)

[duckontheweb]

Using, for example, self._get_property(PRIMARY_GEOMETRY_PROP, str) instead of self.properties.get(PRIMARY_GEOMETRY_PROP) satisfies pytype and is in fact probably the more correct thing to do here. I'll update this extension and look through the others as well to see if we need to implement this elsewhere.