Analyze the sentiment expressed in the tweet. Is it positive, negative, or neutral? Explain the sentiment in relation to the stock mentioned.
TWEET: "RT @dallasmavs: Join us and @Walmart in wishing the best owner in sports @mcuban a very special Happy Birthday! 🎂🎈🎉 https://t.co/SOa4hNk8sV" STOCK: nan DATE: nan
Sentiment: (Provide sentiment here)
Explanation: The tweet sentiment is related to the stock mentioned, and it's important to interpret the context. The LSTM polarity score is nan and the TextBlob polarity score is nan.