Fix isinstance checks when ColumnParallelLinear is None #2050
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ColumnParallelLinear is optional and set to None when Megatron-Core is not installed.
GPT LM head calls isinstance(self.lm_head, ColumnParallelLinear) without guarding None, causing TypeError: isinstance() arg 2 must be a type.
This adds a None guard before the checks so it runs without Megatron-Core.
Fixes #2049.