Creating a subfolder in a nonexisting folder returns 500 instead of 404

[Daniël Loriaux]

When creating a subfolder in a nonexisting folder gives an error with the code 500, this causes confusion as this indicates that the process has failed due to other reasons. Returning a 404 with a descriptive message is clearer.

[Daniël Loriaux]

Added a folder check for existence before creating a subfolder, avoiding a 500 server error if a folder is not found. fixes #3

→ <<cset 6cc2ce0f8b0d>>