isnotanumber is not needed as jinja2 has builtin number test

lib/ansible/plugins/test/math.py

-# (c) 2014, Brian Coca <bcoca@ansible.com>
-#
-# This file is part of Ansible
-#
-# Ansible is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# Ansible is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
-
-from __future__ import absolute_import
-
-import math
-from ansible import errors
-
-def isnotanumber(x):
-    try:
-        return math.isnan(x)
-    except TypeError:
-        return False
-
-class TestModule(object):
-    ''' Ansible math jinja2 tests '''
-
-    def tests(self):
-        return {
-            # general math
-            'isnan': isnotanumber,
-        }