* modules/Gmp/mpz_glue.c (low_get_digits): Yet another bug... The

number zero is special, it is represented with no mpz limbs at all,
but should still produce one digit. In fact, this is the only number
for which low_get_digits will produce a leading zero.

Rev: src/modules/Gmp/mpz_glue.c:1.29
Rev: src/modules/Gmp/testsuite.in:1.9