fix infinite loop for small dataset

[djstrong]

fix infinite loop if number of sentences is smaller than number of sections (30)

[ai-nikolai]

Thank you for submitting the Pull Request. Much appreciated.

Two comments at this stage:

1. Could you add a test case for that? (So that also the exact problem is better understood)
2. I am wondering about the min(1,) statement. It seems that when total/sections > 1 the result will be 1 and otherwise it will be less than 1. -> I am not fully sure how this solves the problem you have encountered. Could you elaborate, please? I think this is where the test case would come in handy.

All the best,
Niko

[djstrong]

Sorry, it should be max.