Remove error message when exiting `--stdin` mode (#4368)
Remove error message when exiting `--stdin` mode (#4368)

fix #4361
1. Remove error message when input a empty string
2. Remove error message when read input from stream
2. Remove error message when interrupt by `CTRL-C`
dmpetrov/dataversioncontrol,dmpetrov/dataversioncontrol,efiop/dvc,efiop/dvc