[release/8.0.1xx] Fix sending MidiPacket when MidiPacket has been created using a point.

[vs-mobiletools-engineering-service2]

Fix sending MidiPacket when MidiPacket has been created using a pointer to a byte[] rather than a byte[] passed as a reference.
MidiPacket.bytes is intiailized to a Array.Empty so it is never null, and so packet.BytePointer is never used.
We therefore need to check for ByteArray.Length being 0.
Midipacket.bytes is never 0 when intiailized to a 0 length byte[] as that constructor checked for 0 length byte[]

Backport of #18981

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• tvOS (no change detected)
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NET (empty diffs)

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✅ API diff vs stable

Legacy Xamarin (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

NET (empty diffs)

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• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

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