Fixes Powersequencer Operator: scene_create_from_selection

[Modicolitor]

-removed error when no strip is selected

• fixed problems in scene changes code (update to 2.8x) -new scene will be renamed automatically after the active strip

...hope that it helps

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Related issue (if applicable): #

What kind of change does this PR introduce? -removed error when no strip is selected

• fixed problems in scene changes code (update to 2.8x) -new scene will be renamed automatically after the active strip

Does this PR introduce a breaking change? I quess, renaming the scene after the active strip is not breaking change, but however a question of taste. I think it gives a better overview when working with this awesome operator

New feature or change

What is the current behavior? scene from strip operator creates error when nothing is selected scene from strip operator creates error on runtime because code for changing the scene was wrong

What is the new behavior?

both error fixes 1. by checking that a strip is at least selected. 2. change the code during scene chage

Other information There is still no UI entry for the operator, now that its working again, maybe that's a next step

love helping, when this is helpful

[NathanLovato]

Thanks for your contribution, I merged manually in 31268b03d987de3d43ec3b9dfcc2c2e67752ff31. Your help is much appreciated!

[Modicolitor]

Awesome, I'll see what other bugs I see. Love powersequencer . Helps a lot 😀

[NathanLovato]

Thanks much! Suggestions for improvements are also welcome.

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