ConditionalLLMBlock unexpected keyword argument 'gen_kwargs'

```
  File "/home/derekh/instructlab/sdg/src/instructlab/sdg/pipeline.py", line 178, in _generate_single
    raise PipelineBlockError(
instructlab.sdg.pipeline.PipelineBlockError: PipelineBlockError(<class 'instructlab.sdg.llmblock.ConditionalLLMBlock'>/knowledge generation): ConditionalLLMBlock.__init__() got an unexpected keyword argument 'gen_kwargs'

```