Fallback to EPG logos if channel misses one

[carlreid]

Description

Fallback to EPG logos if channel misses one

Issues (Fixed or Closed)

• Fixes Bug: Some channel icons are not displaying in Plex #63

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Testing Instructions

Haven't had time to validate, though should see that if a channel is missing a logo being defined that the EPG logo would be used as a fallback.

Visual Changes

• Screenshots/videos attached

Dependencies

• New dependencies added
• System requirements changed

Checklist

• I have followed the Conventional Commits naming convention
• My branch is up to date with the main branch (rebased)
• My code follows the style guidelines and existing patterns of this project
• I have performed a self-review of my own code
• I have commented complex logic
• I have added tests (if applicable)
• All tests are passing
• I have updated documentation as needed