libpromises/evalfunction: Do not crash w/o arguments (3.24.x) #1759

Job	Run time
shellcheck_tests / Run shellcheck on shell scripts	1m 9s
unit_tests / Run Unit Tests	2m 58s
asan_unit_tests / asan_unit_tests	2m 39s
acceptance_tests / acceptance_tests	32m 7s
static_check / static_check	8m 43s
macos_unit_tests / macos_unit_tests	2m 28s
valgrind_check / valgrind_check	5m 6s
valgrind_tests / valgrind_tests	5m 56s
	1h 1m 6s

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