[Bug and Issues][v5.2.x]Found some Comic Manager issues

I’m currently researching and testing the functionality of this tool.
And found some issues.

  1. Error of export when no page in the page list.
  2. Error of export with single page to EPUB.
  3. “Add Existing Page” command move a file.

The third of these is a fatal bug.

1.Error of export when no page in the page list.

I got an error similar to @CelticCoco 's Tutorial and the Video encountered, and it hasn’t been fixed yet.
This occurs when there are no pages in the list, triggering a Python error dialog.
I tested it on MacOSX 10.14.7 and Krita v5.2.9, but it probably also occurs in v5.2.13.

I also thought it would be necessary to add a message dialog to follow up with users who encounter the error.
For example a following message.

2.The error when export a single-page EPUB,

An error occurs and the saved EPUB file is broken.
(Can’t open with EPUB Reader)

3. “Add Existing Page” command move a file.

This is behavior that users cannot predict.
This should be fixed urgently
I thought files from another comic project would be copied, but they were actually moved.
This behavior can destroy page structure at worst.

I’ve attached a screen cast a following.
(Mac’s Finder uses a tree view to show what’s happening inside multiple folders.)

For comparison,This is normal behaviour for a template file.The screencast is here
So The “Add Existing Page” command must copy the file and then add it to the list.

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