Missing conditional check?

[aryamansharda]

Thanks for this great open source resource! I think I may have noticed a potential bug, however. In the Decoder, the user provides:

input_file, n = argv[1:]            
maximum_table_size = pow(2,int(n))

But, they're not used anywhere in the following code. I believe the following change is in order:

if not(len(string) == 0):
        dictionary[next_code] = string + (dictionary[code][0])
        next_code += 1
    string = dictionary[code]

Should be:

 if not(len(phrase) == 0):
            if(len(dictionary) <= maximum_table_size):
                dictionary[next_code] = phrase + (dictionary[code][0])
                next_code += 1
        phrase = dictionary[code]

I ran the code with this change and it continued to work. Thoughts?