Prediction: Internal server error (500) when updating without numeric score input

[chill0r]

Description:
When updating a match prediction progress with no number input (non numeric or empty) in either of the participant fields a 500 Internal Server Error will be returned

What should happen
Invalid fields should be interpreted as "0"

What is happening
500 Internal server error

How to reproduce

1. Generate (any) prediction
2. Insert a non numeric value (or empty) in the Update match progress scores
3. Press "Update match progress"

[chill0r]

Possibly a check for a numeric value in

aligulac/aligulac/simul/formats/match.py

Line 66 in fe3ffed

def modify(self, num_a, num_b):

could fix this (not tested)