Invalid Jinja2 syntax not detected (missing leading {)

[c-po]

The following is not detected:

{% if foo is defined %}
    bar-option
% else %}
    baz-option
{% endif %}

The missing leading { is not found.

[ClausHolbechArista]

The j2lint cannot detect this case, since it is simply not jinja. It will just be interpreted as a regular string, so ignored by the linter. We could create a warning for closing tag (%}) with missing opening tag ({%) but the jinja2 engine accepts this and renders % else %} like any other string, so I am not sure if we want to enforce this.

[c-po]

A warning would probably be a good idea - and could be switched off like other linting rules.