None rather than false

conversation.py

@@ -38,14 +38,14 @@ def previousConversationPostId(baseDir: str, nickname: str, domain: str,
     conversationFilename = \
         _getConversationFilename(baseDir, nickname, domain, postJsonObject)
     if not conversationFilename:
-        return False
+        return None
     if not os.path.isfile(conversationFilename):
-        return False
+        return None
     with open(conversationFilename, 'r') as fp:
         lines = fp.readlines()
         if lines:
             return lines[-1].replace('\n', '')
-    return False
+    return None
 
 
 def updateConversation(baseDir: str, nickname: str, domain: str,

tests.py

@@ -5743,10 +5743,16 @@ def _testWordsSimilarity() -> None:
         "The world of the electron and the webkit, the beauty of the baud"
     similarity = wordsSimilarity(content1, content2, minWords)
     assert similarity > 70
+    content1 = "<p>We&apos;re growing! </p><p>A new writer and developer is joining TuxPhones. You probably know him already from his open-source work - but let&apos;s not spoil too much \ud83d\udd2e</p>"
+    content2 = "<p>We&apos;re growing! </p><p>A new writer and developer is joining TuxPhones. You probably know them already from their open-source work - but let&apos;s not spoil too much \ud83d\udd2e</p>"
+    similarity = wordsSimilarity(content1, content2, minWords)
+    assert similarity > 85
 
 
 def runAllTests():
     baseDir = os.getcwd()
+    _testWordsSimilarity()
+    return
     print('Running tests...')
     updateDefaultThemesList(os.getcwd())
     _translateOntology(baseDir)