Bug Fix: Zero Division Error
Bug Fix: Zero Division Error

If special_keys were not specified (zero in length) but numeric_keys
were, it would cause Zero Division Errors because of the function
get_random_index. Now, an empty string is added to the special_keys
array if numeric_keys array is non-empty. Thus fixing the bug. :)

peanutbutterandcrackers/tuxtype-make-wordlist