'Turn this:
terms == ["1,2,3", "a,b"]
into this:
terms == [[1,2,3], [a, b]]'

def _lookup_variables(self, terms):

    results = []
    for x in terms:
        intermediate = listify_lookup_plugin_terms(x, templar=self._templar, loader=self._loader)
        results.append(intermediate)
    return results
