Alerta doesn't return all alert with get_alerts

[francesco-amato-argo]

Hi,
I noticed that alerta doesn't return all alert with function get_alerts
I think that the problem is the pagination

I changed the code of api.py to get function working

def get_alerts(self, query=None, page=1, page_size=None):
r = self.http.get('/alerts', query, page=page, page_size=page_size)
data = [Alert.parse(a) for a in r['alerts']]
while r['pages'] > r['page']:
r = self.http.get('/alerts', query, page=r['page']+1, page_size=page_size)
data.extend([Alert.parse(a) for a in r['alerts']])
return data

I hope it can help someone else with the same problem