Fix #327 set default row of gradio webui to 1 and drop empty/blank row

[Raibows]

Fix #327 .
Here are the changes:

1. set the default number of row of dataFrame of launch_gradio_widget to 1
2. First replace all blank/empty input rows with np.nan which then could be dropped by the following np.dropna

Happy to take advice.😀 @lvwerra

[lvwerra]

Awesome, thanks @Raibows! Would you mind running make style && make quality to make the code quality checks happy?

[Raibows]

Awesome, thanks @Raibows! Would you mind running make style && make quality to make the code quality checks happy?

I have runned make style && make quality to reformat the codes. But the github auto checks remained failed status. I guess maybe the difference versions of black caused it. I use python 3.8.10 with black 21.6b0.

Do you have any advice on it? Thanks.

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[lvwerra]

Yes, indeed strange, it changed a few files it shouldn't have. I am using black==22.8.0. If that doesn't work I think just reverting the changes on the tokenizer and file_utils files should fix it.

[Raibows]

@lvwerra I have reverted these changes. Now it only formats the gradio.py. Please check it.

Update: Sorry for that I forgot to install the isort package. I run the style reformat again. And these commits are squashed to one.