Fix lib panic on insert_many

[j-mendez]

This removes the panic that happens on insert many.
We should not have panics in a library production code.

[tyt2y3]

sorry, I don't think this is a proper fix, yes it removes the panic, but the resulting query will still be wrong.
ideally, we'd have to loop over the models a second time with a complete list of all columns to constuct the insert statement

[j-mendez]

sorry, I don't think this is a proper fix, yes it removes the panic, but the resulting query will still be wrong.

ideally, we'd have to loop over the models a second time with a complete list of all columns to constuct the insert statement

@tyt2y3 hi do we want to add the code for the second loop? Can try to look into this. Right now forking the lib just to prevent this one panic since it shuts down my server.