### Description ## Click Submit changes when the file is over 3MB, will corrupt the repository instance, want to fix this Bug. ## This Bug only occurs when the repository is empty, and does not occur if there are any files in the repository such as "README.MD" ### Gitea Version v1.20.0、v1.20.2 ### Can you reproduce the bug on the Gitea demo site? Yes ### Log Gist _No response_ ### Screenshots    ### Git Version git version 2.37.1.windows.1 ### Operating System Ubuntu18.04LTS ### How are you running Gitea? Binary file http://ip:port ### Database SQLite