BUGFIX for declared terminals

lark/load_grammar.py

@@ -656,16 +656,18 @@ def resolve_term_references(term_defs):
                         raise GrammarError("Rules aren't allowed inside terminals (%s in %s)" % (item, name))
                     if item.type == 'TERMINAL':
                         term_value = term_dict[item]
+                        assert term_value is not None
                         exp.children[0] = term_value
                         changed = True
         if not changed:
             break
 
     for name, term in term_dict.items():
-        for child in term.children:
-            ids = [id(x) for x in child.iter_subtrees()]
-            if id(term) in ids:
-                raise GrammarError("Recursion in terminal '%s' (recursion is only allowed in rules, not terminals)" % name)
+        if term:    # Not just declared
+            for child in term.children:
+                ids = [id(x) for x in child.iter_subtrees()]
+                if id(term) in ids:
+                    raise GrammarError("Recursion in terminal '%s' (recursion is only allowed in rules, not terminals)" % name)
 
 
 def options_from_rule(name, *x):