mkexp: changed 'list' filter replacement to use original filter for iterables

mkexp

@@ -347,9 +347,10 @@ template_env.filters['split'] = lambda x, s, m=-1: x.split(s, m)
 template_env.filters['filter'] = lambda x, f=None: filter(f, x)
 
 # - Replace 'list' handling simple values and strings as singleton lists
-def list_singleton(x):
+list_original = template_env.filters['list']
+def list_singleton(x, *args, **kwargs):
     if '__iter__' in dir(x):
-        return list(x)
+        return list_original(x, *args, **kwargs)
     return [x]
 template_env.filters['list'] = list_singleton