FIX: use len(unique) to estimate unique entry (#151)

* Addressed an issue in model.py, where having multiple distances between gates (either by manually setting the radar to have varying steps or by small float inaccuracies) causes the reading of a ODIM h5 file to crash. More info on this in issue #150.
* Update history.md
---------

Co-authored-by: Martin Paule <martin.paule@microstep-mis.com>
Co-authored-by: Kai Mühlbauer <kmuehlbauer@wradlib.org>

docs/history.md

@@ -1,5 +1,9 @@
 # History
 
+## 0.4.3 (2024-02-24)
+
+* FIX: use len(unique) to estimate unique entry for odim range ({pull}`151`) by [@martinpaule](https://github.com/martinpaule).
+
 ## 0.4.2 (2023-11-02)
 
 * FIX: Fix handling of sweep_mode attributes ({pull}`143`) by [@mgrover1](https://github.com/mgrover1)

xradar/model.py

@@ -627,7 +627,7 @@ def get_range_attrs(rng=None):
     if rng is not None:
         diff = np.diff(rng)
         unique = np.unique(diff)
-        if unique:
+        if len(unique) == 1:
             spacing = "true"
             range_attrs["meters_between_gates"] = diff[0]
         else: