FixImagePath NPE on NewMastodonProject from ImageOpenedInImageJ about mastodon HOT 5 OPEN

(I apparently cannot assign the issue to myself, nor can I give it a label... but I'm okay with that, just FYI)

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How do you reproduce this bug? I have no error message when creating a project from an ImagePlus.

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1. fresh Fiji
2. install Mastodon update site
3. open any TIFF into Fiji
4. open Mastodon
5. choose "new Mastodon project", then "use an image opened in ImageJ"
6. click "create", Mastodon opens normally
7. click File -> Fix Image Path
8. NPE comes out...

from mastodon.

Ahhhhhh I missed the last part.
Indeed:

Do you want to work on it?

from mastodon.

I can....

It breaks here, I would solve it by adding a guarding-test before that line, e.g.,

if (project == null || project.getProjectRoot() == null) {
     code to create a different dialog content -- a content that informs
     that it cannot be fixing a path in a project when there's no project created yet
}

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