Experimental parser: small cleanup

tools/lexer_generator/nfa_builder.py

Index: tools/lexer_generator/nfa_builder.py
diff --git a/tools/lexer_generator/nfa_builder.py b/tools/lexer_generator/nfa_builder.py
index 97ecfa15512dd843c8d86170349a378e020f56cc..dfb57504a63745348e0fb5672354de21b9aa8b23 100644
--- a/tools/lexer_generator/nfa_builder.py
+++ b/tools/lexer_generator/nfa_builder.py
@@ -309,22 +309,19 @@ class NfaBuilder(object):
   def __flatten_terms(terms, name):
     for term in terms:
       assert isinstance(term, Term)
-      if not term:
-        continue
       if term.name() == name:
         for arg in term.args():
           if arg:
             yield arg
       else:
-        yield term
+        if term:
+          yield term
 
   @staticmethod
   def __flatten_literals(terms):
     acc = ()
     for term in terms:
       assert isinstance(term, Term)
-      if not term:
-        continue
       if term.name() == 'LITERAL':
         acc += term.args()
       else: