From d2a91801757e349b887a4911021c41c46be80289 Mon Sep 17 00:00:00 2001
From: Michael Hardman <29800382+mrhardman@users.noreply.github.com>
Date: Wed, 15 Jan 2025 10:32:52 +0000
Subject: [PATCH] Changes required to load output from a grid-free BOUT.0.nc
 file, necessary for MMS tests of the differential operators.

---
 xbout/geometries.py | 2 +-
 xbout/load.py       | 4 +---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/xbout/geometries.py b/xbout/geometries.py
index dd1b6692..04696b67 100644
--- a/xbout/geometries.py
+++ b/xbout/geometries.py
@@ -214,7 +214,7 @@ def apply_geometry(ds, geometry_name, *, coordinates=None, grid=None):
                 dz = updated_ds["dz"]
 
             z0 = 2 * np.pi * updated_ds.metadata["ZMIN"]
-            z1 = z0 + nz * dz.data[()]
+            z1 = z0 + nz * dz.data[0,0]
             if not np.all(
                 np.isclose(
                     z1,
diff --git a/xbout/load.py b/xbout/load.py
index 5c3d8a61..f30b0b81 100644
--- a/xbout/load.py
+++ b/xbout/load.py
@@ -378,9 +378,7 @@ def attrs_remove_section(obj, section):
     # by xBOUT, not by BOUT++
     ds.bout.fine_interpolation_factor = 8
 
-    if ("dump" in input_type or "restart" in input_type) and ds.metadata[
-        "BOUT_VERSION"
-    ] < 4.0:
+    if ("dump" in input_type or "restart" in input_type) and ("BOUT_VERSION" in ds.metadata and ds.metadata["BOUT_VERSION"] < 4.0):
         # Add workarounds for missing information or different
         # conventions in data saved by BOUT++ v3.x.
         for v in ds: