Draft for EZP-20505: IO Exception when file isn't found

This PR is a draft for fixing https://jira.ez.no/browse/EZP-20502.

In its current state, it only replaces the brutal exception with an error log entry.

TODO
- [ ] See if this replacement is fit for all purposes (example: copy, update...)
- [ ] Apply it to IO\FileSystem as well
- [ ] Consider adding configuration to enable/disable the lax handling