closes #159

timetable.py

@@ -8,7 +8,10 @@ def timetable():
 		kw=0
 	else:
 		kw=int(request.args['kw'])
+	try:
 		start = date.today() - timedelta(days=date.today().weekday() -7*kw)
+	except:
+		start = date.today() - timedelta(days=date.today().weekday())
 	days = [{'date': start, 'lectures': [], 'atonce':0, 'index': 0 }]
 	earlieststart=time(23,59)
 	latestend=time(0,0)