provide better error message for get_path()  by disabling exception in Parrot_locate_runtime_file() Courtesy of Andy Dougherty <doughera@lafayette.edu>
provide better error message for get_path() 
by disabling exception in Parrot_locate_runtime_file()
Courtesy of Andy Dougherty <doughera@lafayette.edu>

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@8980 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

gitster/parrot,fernandobrito/parrot,tewk/parrot-select,tewk/parrot-select,parrot/parrot,gitster/parrot,fernandobrito/parrot,FROGGS/parrot,tkob/parrot,gagern/parrot,gagern/parrot,tkob/parrot,youprofit/parrot,gagern/parrot,tkob/parrot,FROGGS/parrot,fernandobrito/parrot,youprofit/parrot,parrot/parrot,parrot/parrot,gitster/parrot,fernandobrito/parrot,gagern/parrot,parrot/parrot,tkob/parrot,parrot/parrot,tkob/parrot,tkob/parrot,gagern/parrot,tkob/parrot,gagern/parrot,tewk/parrot-select,youprofit/parrot,FROGGS/parrot,fernandobrito/parrot,FROGGS/parrot,fernandobrito/parrot,youprofit/parrot,tewk/parrot-select,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,gagern/parrot,tkob/parrot,youprofit/parrot,gitster/parrot,tewk/parrot-select,gitster/parrot,youprofit/parrot,youprofit/parrot,gitster/parrot,tewk/parrot-select,fernandobrito/parrot,gitster/parrot,FROGGS/parrot,FROGGS/parrot,tewk/parrot-select