Does anybody know how to prevent commits to a Subversion code repository when there is no commit comment entered?
If you are using TortoiseSVN only then you can add TortoiseSVN's property to the root directory:
property name: tsvn:logminsize
value: 1
This will disable OK button in TortoiseSVN commit window then Message is empty.
Please be aware that this property is TortoiseSVN specific it might not work with other SVN client.