Logger instantiation

[pietrolesci]

https://github.com/PyTorchLightning/lightning-transformers/blob/aa8f48addc9d16733cfb7572cf19cba17cad29a6/lightning_transformers/core/instantiator.py#L105

Hi there,

I think the above line is the cause of not seeing the logger even when requesting it with

 python train.py task=nlp/summarization dataset=nlp/summarization/xsum +trainer/logger=wandb

Maybe change to:

if cfg["trainer"].get("logger"):
    ...

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