[PCC] Revised Parrot_pcc_split_signature_string() to handle the case of no incoming arguments.  Rather than randomly walking off the end of the C string when parsing signatures, mark that there are no incoming arguments correctly.
[PCC] Revised Parrot_pcc_split_signature_string() to handle the case of no
incoming arguments.  Rather than randomly walking off the end of the C string
when parsing signatures, mark that there are no incoming arguments correctly.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@45196 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot