Modify MINIMUM_ALLOWED_NUMBER_CLASSES definition

[pedropaulofb]

Currently MINIMUM_ALLOWED_NUMBER_CLASSES refers to the TOTAL number of classes a taxonomy has.

However, a taxonomy may have more than MINIMUM_ALLOWED_NUMBER_CLASSES but all their classes can be of type "other" and, hence, no valid test is performed.

The best way to solve this would be by changing MINIMUM_ALLOWED_NUMBER_CLASSES definition so it can correspond to the NON-OTHER number of classes a taxonomy has. I.e., only classifications different than "other" are counted.

[pedropaulofb]

@mozzherina, please note that for now you have no action regarding this issue. It is assigned to me and I'll work on it in February. After closing this issue, I'll create another one regarding its implementation.