8.6.10: Save of opened file without changing name raise exception (MDF4)

[xstkbm]

If one:

1. Open a file
2. Modify something (might not be necessary)
3. Save without changing the name

An AttributeError is raised in the if block just before the return statement.

As far as I can tell this happens because the first statement in the if block calls self.close(). In that method
self.header and self.identification are deleted. Later in the if block (in the save method) self.header and self.identification
are deleted again causing the AttributeError to be raised.

If my analysis is correct it should enough to delete the statements where self.header and self.identification are deleted in the save methods if block.

[danielhrisca]

@xstkbm please try the development branch

[xstkbm]

Seems to work fine when I manually apply the changes you did here 8569c99