sentence.py : tag_entity() -> TypeError

[ManuelLobo]

When the argument Exclude is passed as None, it fails in line 196:
print self.text[tlist[0].start:exclude[0][0]] #Fails if exclude is None
print self.text[exclude[0][0]:exclude[0][1]]
print self.text[exclude[0][1]:tlist[-1].end]

Traceback (most recent call last):
...
...
File "/home/h/Desktop/IBEnt2/src/text/sentence.py", line 196, in tag_entity
print self.text[tlist[0].start:exclude[0][0]]
TypeError: 'NoneType' object has no attribute 'getitem'