ShocSimple.topology can raise an error on variables without a standard_name

[mx-moth]

emsarray/src/emsarray/conventions/shoc.py

Lines 94 to 103 in 82ad399

	latitude = next(
	name for name, variable in self.dataset.variables.items()
	if variable.dims == self._dimensions
	and variable.attrs["standard_name"] == "latitude"
	)
	longitude = next(
	name for name, variable in self.dataset.variables.items()
	if variable.dims == self._dimensions
	and variable.attrs["standard_name"] == "longitude"
	)

This code tries to find latitude and longitude variables. If a variable has the correct dimensions but does not have a standard name, this will raise a KeyError. The code should be updated to handle this case.