I am not sure if I did something stupid that my IntelliJ does this, but when I commit changes in SVN I always have the same predefined commit message in the text area (\"changed
Under "Version Control" and "Confirmation", you have a check button : "Clear initial commit message".
That might be a better solution in case you want to always have an empty text-field to input your commit message. Otherwise you can modify that file.
UPDATE IntelliJ Version:
IntelliJ IDEA 2018.3.5 (Ultimate Edition)
Build #IU-183.5912.21, built on February 26, 2019
macOS 10.14.3
Option Clear initial commit message
is now under Version Control
> Commit Dialog