Implemented NoneType check for html parameter

[JannikSeuss]

Parameter html was assumed to be type of string. This is not always the case, therefore a check is implemented to prevent the application from crashing

I executed the following code and after a while it threw an error because the html parameter did not have the proper type.

tweetCriteria = got.manager.TweetCriteria().setQuerySearch('SEZ').setEmoji("unicode")
tweets = got.manager.TweetManager.getTweets(tweetCriteria)

Thrown Error:

---

AttributeError Traceback (most recent call last)

in ()
45 for st in searchterms:
46 tweetCriteria = got.manager.TweetCriteria().setQuerySearch(st).setEmoji("unicode")
---> 47 tweets = got.manager.TweetManager.getTweets(tweetCriteria)
48 ct = ct + 1
49 print('st number ' + str(ct))

1 frames

/usr/local/lib/python3.6/dist-packages/GetOldTweets3/manager/TweetManager.py in getTweets(tweetCriteria, receiveBuffer, bufferLength, proxy, debug)
86 tweet.username = usernames[0]
87 tweet.to = usernames[1] if len(usernames) >= 2 else None # take the first recipient if many
---> 88 rawtext = TweetManager.textify(tweetPQ("p.js-tweet-text").html(), tweetCriteria.emoji)
89 tweet.text = re.sub(r"\s+", " ", rawtext)
90 .replace('# ', '#').replace('@ ', '@').replace('$ ', '$')

/usr/local/lib/python3.6/dist-packages/GetOldTweets3/manager/TweetManager.py in textify(html, emoji)
182 # Step 1, prepare a single-line string for re convenience
183 puc = chr(0xE001)
--> 184 html = html.replace("\n", puc)
185
186 # Step 2, find images that represent emoji, replace them with the

AttributeError: 'NoneType' object has no attribute 'replace'