👟 Reproduction steps

Currently it seems possible to use only white space to compose an empty Subject/Title & Message Body.
This causes one to send a completely empty message which may not be right (atleast for Push Notifs).

👍 Expected behavior

Don't allow sending empty messages.

👎 Actual Behavior

We can send empty messages.

🎲 Appwrite version

Version 1.5.x

💻 Operating system

MacOS

🧱 Your Environment

No response

👀 Have you spent some time to check if this issue has been raised before?

• I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• I have read the Code of Conduct