gnucash master: Clear the option slots the right way.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/919fe76c (commit)
	from  https://github.com/Gnucash/gnucash/commit/133f03d4 (commit)



commit 919fe76c95faece9b227227aa75aea1496acfdeb
Author: John Ralls <jralls at ceridwen.us>
Date:   Mon Jul 6 13:55:13 2015 -0700

    Clear the option slots the right way.
    
    Deleting the frame leaves the value with an invalid pointer.



Summary of changes:
 src/libqof/qof/kvp_frame.cpp | 11 +++++++++++
 src/libqof/qof/kvp_frame.hpp |  5 +++++
 src/libqof/qof/qofbook.cpp   |  4 +---
 3 files changed, 17 insertions(+), 3 deletions(-)