Unintended `AttributeError` when attempting to download granules before an order

[trey-stafford]

Prior to icepyx 2, it was possible to search for data and then immediately call download_granules, without calling order_granules first.

Now, it is expected that a harmony order be placed first. However, an AttributeError is raised instead of a ValueError with an informative error message:

import datetime as dt

import icepyx as ipx


date_range = (dt.date(2007, 1, 1), dt.date(2024, 10, 28))

lower_left_lon=-49.149
lower_left_lat=69.186
upper_right_lon=-48.949
upper_right_lat=69.238

result = ipx.Query(
    "ATL06",
    [
        lower_left_lon,
        lower_left_lat,
        upper_right_lon,
        upper_right_lat,
    ],
    date_range,
)

result.download_granules("downloaded-data/ATL06/")

Traceback (most recent call last):
  File "/home/trst2284/code/icepyx/scratch.py", line 24, in <module>
    result.download_granules("downloaded-data/ATL06/")
  File "/home/trst2284/code/icepyx/icepyx/core/query.py", line 1028, in download_granules
    status = self.last_order.status()
             ^^^^^^^^^^^^^^^
AttributeError: 'Query' object has no attribute 'last_order'

I think we just need to fix this line to:

if not hasattr(self, "last_order")