Should check where the tree path is a directory or a file when create a new file in web ui

[yp05327]

Description

Steps:

• click a file in your repo
• click Add File -> New File

Gitea Version

latest

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

build

Database

None