fix: default str for json dumps (bp #12138) (#12139)
fix: default str for json dumps (bp #12138) (#12139)

(cherry picked from commit f055604167cf762655d6d0d49cee07016e1b3317)

Co-authored-by: Shivam Mishra <4ebb2467f711fe1bc2da1914bc39d525c5d5279d@gmail.com>
vjFaLk/frappe,vjFaLk/frappe,vjFaLk/frappe,vjFaLk/frappe