from django import template


register = template.Library()

@register.filter
def timezone_format(value):
	""" Check the value of the timezeone offset and, if postive, add a plus sign"""
	try:
		if int(value) > 0:
			value = '+' + str(value)
	except:
		value = None
	return value
@@ -258,12 +258,10 @@
 e = 
-None
+''
 %0A%09re

update timezone_format custom filter to display blank string if exception