fix: handle None contracts from ib_async v2.0.1 qualifyContractsAsync#578
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In ib_async v2.0.1, qualifyContractsAsync now returns None for contracts that fail to qualify (unknown or ambiguous), preserving positional correspondence with input contracts. This caused AttributeError when accessing contract properties on None values. Added filtering to remove None values after qualify_contracts call, ensuring only valid contracts are processed.
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In ib_async v2.0.1, qualifyContractsAsync now returns None for contracts that fail to qualify (unknown or ambiguous), preserving positional correspondence with input contracts. This caused AttributeError when accessing contract properties on None values.
Added filtering to remove None values after qualify_contracts call, ensuring only valid contracts are processed.