Error for long time filetered data requests selecting no data

[pacesm]

The client splits long time selection into multiple chunk requests. When none of the chunk requests select any data the final concatenation fails:

Traceback (most recent call last):
  File ".../lib/python3.10/site-packages/xarray/structure/concat.py", line 254, in concat
    first_obj, objs = utils.peek_at(objs)
  File ".../lib/python3.10/site-packages/xarray/core/utils.py", line 250, in peek_at
    peek = next(gen)
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File ".../test.py", line 43, in <module>
    data = data.as_xarray()
  File ".../VirES-Python-Client/src/viresclient/_data_handling.py", line 833, in as_xarray
    ds = xarray.concat(ds_list, dim=self._time_variable)
  File ".../lib/python3.10/site-packages/xarray/structure/concat.py", line 256, in concat
    raise ValueError("must supply at least one object to concatenate") from err
ValueError: must supply at least one object to concatenate

(full paths were redacted)

xarray 2025.4.0
viresclient 0.14.1