Improve no disk space error handling when updating plugins
|Reported by:||Daedalon||Owned by:|
I received the following uninformative error message when trying to update a plugin (roughly translated from Finnish):
Error on updating BulletProof Security. Cannot create folder. /[WPDIR]/wp-content/upgrade/bulletproof-security.tmp.
The error was caused by not having enough disk space. The plugin update should check if that's the reason for the error and then display a more informative error message.