##### SUMMARY
An invalid syntax within a jinja2 statement results in the statement being returned instead of an syntax error.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
jinja2

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.9.0.dev0
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/user/PycharmProjects/ansible-2/lib/ansible
  executable location = /home/user/PycharmProjects/ansible-2/bin/ansible
  python version = 3.7.3 (default, Mar 26 2019, 21:43:19) [GCC 8.2.1 20181127]
```

##### CONFIGURATION

##### OS / ENVIRONMENT

ArchLinux

##### STEPS TO REPRODUCE

```yaml
- name: Test
  hosts: localhost
  gather_facts: false
  become: false
  strategy: linear
  tasks:
    - debug:
        msg: "{{ foo | ipaddr('address')) }}"
```

##### EXPECTED RESULTS

Syntax error (two closing `)`-characters)

##### ACTUAL RESULTS

```paste below
ok: [localhost] => {
    "msg": "{{ foo | ipaddr('address')) }}"
}
```

@sivel 
tests = [
            'foo',
            '{{ foo',
            '{% foo',
            '{# foo',
            '{{ foo %}',
            '{{ foo #}',
            '{% foo }}',
            '{% foo #}',
            '{# foo %}',
            '{# foo }}',
            '{{ foo {{',
            '{% raw %}{% foo %}',
        ]
        for test in tests:
            self.assertFalse(self.templar.is_template(test))
    def test_is_template_raw_string(self):
        res = self.templar.is_template('foo')
        self.assertFalse(res)
    def test_is_template_none(self):
        res = self.templar.is_template(None)
        self.assertFalse(res)
    def test_template_convert_bare_string(self):