learn.predict throws error when passed PIL image

[yousifmansour]

This fixes the issue reported here which is blocking running a cell in chapter 1 of the book. Below is a screenshot of the cell in question.

This seems to have started happening with fastai 2.7.11, and since fastbook installs fast ai >=2.6, its not easy for a beginner (or non python expert like myself) to figure this out.

Enjoying the book otherwise, thank you everyone involved.

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[ofields]

Yep, this tripped me up as well. The simple fix in your PR worked for me - thanks!