catch get_lora_checkpoints() exceptions

[w-e-w]

AssertionError if is not LoRA are safetensors
TypeError ss_sd_model_name is None not all safetensors have metadat
this will cause the UI to not load

update:
draft for now, Irrc theres is a more proper way of telling apart lora version

[contentis]

LGTM

[w-e-w]

in webui using extra networks tab we allow user to manually set what the type of lora model
the information is stored beside the model under the same name but with .json extension

particularly
we do this in webui because some older models or non safetensors does not have the metadata

so the the order of retrieving the version information should be
lora_model_name.json > safetensors metadata > "unknow"

in my opinion this PR can be merged now to get TRT "working"
but a follow-up Improvement PR should be made when someone (possibly by me if I have time) to fetch the metadata in that order

undraft and request merge

example image of user defined metadata

[contentis]

This is great to know. Would you mind adding this as an issue?
Generally, LoRA support is not quite what I'd want it to be ATM. Ideally, I'd like to remove the whole export in the future and have it working "automatically".