Fix(drawable): Prevent crash with null custom ambient sound info during save

[seer-by-sentry]

Fixes CLIENT-43Y. The issue was that: Invalid m_customSoundAmbientInfo pointer in Drawable causes access violation during serialization in DynamicAudioEventInfo::getOriginalName.

• Added a null pointer check for 'm_customSoundAmbientInfo' in 'Drawable::xfer' to prevent crashes during save operations.
• If 'm_customSoundAmbientInfo' is NULL when custom ambient sound data is expected, a debug crash is logged, and an empty string is written instead of dereferencing a null pointer.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 12145397

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