git commit didn't make commit

[Bwlee605]

After changing some files, add, and use git commit,
"Aborting commit due to empty commit message" occurs.
And then checking status by 'git status' ,
"
On branch master
Your branch is up to date with 'origin/master'.

Changes to be committed:
(use "git reset HEAD ..." to unstage)
"
comes out which mean commit is not successfully operated.

Also, if I use ' git commit -m 'test' ', it works. Just 'git commit' not working.

Can anybody help?