Fix "ấn" + "]" should return "ấn]", not "aans]" in non-VN mode

Since "]" is a proper IM key, the check will pass and the fallback
sequence will be returned.

bogo/bogo.py

@@ -155,7 +155,7 @@ def default_return():
             # The prefix "_" means undo.
             for trans in map(lambda x: "_" + x, trans_list):
                 new_comps = transform(new_comps, trans)
-    
+
             # TODO refactor
             if config["input-method"] == "telex" and \
                     len(fallback_sequence) >= 1 and \
@@ -173,7 +173,7 @@ def default_return():
 
     logging.debug("%s, %s", utils.join(new_comps), fallback_sequence)
 
-    if config['skip-non-vietnamese'] == True and (key.isalpha() or key in im) and \
+    if config['skip-non-vietnamese'] == True and key.isalpha() and \
             not is_valid_combination(new_comps, final_form=False):
         return fallback_sequence, fallback_sequence
     else:

test/test_engine.py

@@ -144,7 +144,7 @@ def test_undo(self):
     def test_non_vn(self):
         def atomic(word):
             eq_(process_seq(word, config=c_non_vn), word)
-        
+
         tests = [
             "system",
             "Virtualbox",
@@ -162,6 +162,7 @@ def atomic(word):
             yield atomic, test
 
         eq_(process_seq_non_vn("aans."), "ấn.")
+        eq_(process_seq_non_vn("aans]"), "ấn]")
         # eq_(process_seq_non_vn("aans.tuongwj"), "ấn.tượng")
         eq_(process_seq_non_vn("gi[f"), "giờ")
         eq_(process_seq_non_vn("taojc"), "taojc")