0E800 Thanks my friend. I think that i am at the right way now but i need some more help. FYI I modified the file "vendor/flarum/core/src/Core/Validator/PostValidator.php" and commented the line
'required'
to make the post content field NOT required. Then i cleared the cache and tried to post a new discussion with only the discussion title filled. Guess what ?? It worked!!! But now my problems are:
1⃣ How can override that function so my changes will not be removed on next flarum updates
2⃣ How can i prevent users posting empty replies ?? It seems that the post validator is the same for Both "Post a new Discussion" and "Reply" Forms !! Am i right ??
?