gnucash stable: avoid strlen where possible

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/d617129d (commit)
	from  https://github.com/Gnucash/gnucash/commit/f30fcc2a (commit)



commit d617129db83b37cc12b3c2434c55e73efb4d98d6
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Wed Nov 1 20:57:05 2023 +0800

    avoid strlen where possible
    
    if testing emptiness, test *str instead.



Summary of changes:
 libgnucash/backend/xml/gnc-account-xml-v2.cpp   | 4 ++--
 libgnucash/backend/xml/gnc-address-xml-v2.cpp   | 2 +-
 libgnucash/backend/xml/gnc-commodity-xml-v2.cpp | 8 +++-----
 libgnucash/backend/xml/gnc-employee-xml-v2.cpp  | 2 +-
 libgnucash/backend/xml/gnc-entry-xml-v2.cpp     | 2 +-
 libgnucash/backend/xml/gnc-invoice-xml-v2.cpp   | 2 +-
 libgnucash/backend/xml/gnc-order-xml-v2.cpp     | 2 +-
 libgnucash/backend/xml/gnc-pricedb-xml-v2.cpp   | 4 ++--
 libgnucash/backend/xml/gnc-xml-backend.cpp      | 2 +-
 libgnucash/backend/xml/xml-helpers.h            | 2 +-
 10 files changed, 14 insertions(+), 16 deletions(-)