SDK - Components - Fixed small bugs in graph component resolving (#2269)
SDK - Components - Fixed small bugs in graph component resolving (#2269)

Fixed accessing inputs and outputs without checking for None.
Fixed case where the default value of graph component input has to be passed to component as an argument.
kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines