Segfault when parsing sentence with a quantity in the form of <number>M from Wikipedia text.
This segfault happens with Freeling v4.1 compiled with gcc (GCC) 8.2.1 20181127.
Steps to reproduce:
1. create test-1 file with sentence:
Si la massa de l'estrella se situa entre 0,5 i 8M, en esgotar tot l'hidrogen, el seu nucli posseïx una temperatura alta.
 
