Update pose_utils.py

[starhiking]

fix the error when existing invalid views in the scene.
Beside the pose_boundary.npy will be generated, it also will generate "view_imgs.txt" to mark which views are used.

[Sazoji]

You deserve a metal for this, edited the model loading to handle the tuple for a separate colmap2poses file after I got fed up with total rejection when trying to map video just to get stuck with img2poses failing at the end while the colmap2nerf spaghetti passed totally fine.

[Achint08]

Saviour!

[RiverOtherSide]

thanks!!!

[Holmes-Alan]

Thanks!!

[lagrange10]

thanks!! I am new in GitHub, only the third time I saw this issue did I see the awesome solve.

[cezarbbb]

Awesome 😎 bro! Appreciate that.

[BingyuJi]

oh~ you are so 🐂 Thanks

[shashwatsuri]

Works Perfectly!

[BingyuJi]

您好，来信已收到，我会尽快处理。如有特殊情况请与18852073359联系。