[Python] python bottle do not display template output when login decorator is used

I am trying to use decorator for verifying user in bottle web framework for python. following is my login decorator code

def decorate_verify_user(fun):
def nothing():
logging.debug("no username password available")
return template("failed_login.html",post_data="No post_data")
@wraps(fun)
def do_it():
if(verify_user()==True):
fun()
else:
nothing()
logging.debug("function name of do_it is {}".format(do_it.__name__))
return do_it



following function uses decorator

@route('/view_antigen', method='POST')
@decorate_verify_user
def view_antigen():
logging.debug('view_antigen() entered...')
m=mysql_lis()
con=m.get_link(astm_var.my_host,astm_var.my_user,astm_var.my_pass,astm_var.my_db)
cur=m.run_query(con,prepared_sql='select * from antigen',data_tpl=())
all_data=m.get_all_rows(cur)
logging.debug("antigen data:{}".format(all_data))
if(all_data==None):
logging.debug('antigen data not found')
m.close_cursor(cur)
m.close_link(con)
return False
m.close_cursor(cur)
m.close_link(con)
logging.debug('view_antigen.html entering...')
return template("view_antigen.html",all_data=all_data)


if I remove @decorate_verify_user line, template shows as expected But, with @decorate_verify_user line, only blank page is shown. (However, browser web developer tool shows all POST variables correctly. Log file also shows all statements upto line logging.debug('view_antigen.html entering...')

What is explanation/correction of this behavior?

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