error return adjustment for client

[tbal999]

sometimes you get:

failed to generate the result PDF
in func (c *Client) StoreContext(ctx context.Context, req Request, dest string) error

when you shouldn't.
I.E when the server is still processing a file.

so I did the below in a fork

https://github.com/tbal999/gotenberg-go-client/blob/48b3dc83b02f25f223a06bed4dc8cd51a2c18f60/client.go#L140

and it fixed the issue by returning an error & status if the status is an error.

could you please consider this PR.

thanks

[gulien]

Hello @tbal999,

I alas don't have time to maintain this client, so no ETA for a review / merge / release..

[tbal999]

no worries/rush gulien - just forked it & it's working fine for my use case.