Potential Error in `_page_generator.py`

[CommitThis]

Hello,

I was trying to get the write image function working and may have come across an error in _page_generator.py. Unfortunately I don't have a specific error for you as I couldn't get it working end-to-end and have since moved on (now awaiting the next proper release), but I noticed that there are some strange things occurring in the aforementioned page.

With respect to the following code:

Kaleido/src/py/kaleido/_page_generator.py

Lines 56 to 64 in f0a26a5

	plotly = (
	(
	Path(plotly.__file__).parent / "package_data" / "plotly.min.js",
	"utf-8",
	).as_uri(),
	"utf-8",
	)
	if not plotly.is_file():
	plotly = (DEFAULT_PLOTLY, "utf-8")

I'm not quite sure what is supposed to be happening here. It looks like you're trying to call both as_uri() and is_file() on a tuple. I may have missed something but it feels like you wanted to do something like this:

plotly_path = Path(plotly.__file__).parent / "package_data" / "plotly.min.js"
if not plotly_path.is_file():
    plotly = (DEFAULT_PLOTLY, "utf-8")
else:
    plotly = (plotly_path.as_uri(), "utf-8")

In any case, apologies in advance if I've missed something and this is a non-issue.