Improve code readability.

[rdelillo]

Changelog Description

Changes:

• Properly detect missing shot instances from audio and plate products.
• Handle track name with spaces properly
• Code readability changes

Additional review information

• report some of the changes from Resolve from Fix vertical align and report reviewable source feature. ayon-resolve#50
• report some of the changes from Hiero from Improve create_shot_clip code readability. ayon-hiero#50

Testing notes:

• TODO: need to be tested against Flame

1. Should work exactly as before.