fix: Fix AttributeError when block.top_k is None in BlockRelabelProce…

[TwinkleXD]

Problem

The BlockRelabelProcessor crashes with AttributeError: 'NoneType' object has no attribute 'get' when block.top_k is None.

Root Cause

The original code assumes block.top_k always exists and is not None:

confidence = block.top_k.get(block.block_type)

Solution

Add defensive checks to handle cases where block.top_k is None or missing:

• Check if top_k attribute exists and is not None
• Provide default confidence value (0.0) for missing cases
• Add exception handling for relabeling process

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