truncate_corrupted_offsets() crashes due to _xml2dict returning None if <footer><info> is empty

src/pyxdf/pyxdf.py

@@ -689,7 +689,7 @@ def _truncate_corrupted_offsets(temp, streams):
     for stream_id, stream in temp.items():
         # First check if there are extra samples - this is the primary evidence
         # of a potential pylsl#67, liblsl#246 bug.
-        footer = streams.get(stream_id, {}).get("footer", {}).get("info", {})
+        footer = streams.get(stream_id, {}).get("footer", {}).get("info") or {}
         sample_count_str = footer.get("sample_count", [None])[0]
         if sample_count_str is None:
             continue

test/test_truncate_corrupted_offsets.py

@@ -188,3 +188,25 @@ def test_truncation_of_samples_and_corrupted_clock_offset():
         expected_timestamps,
         atol=1e-6,
     )
+
+
+def test_no_crash_when_footer_info_is_none():
+    """Streams with empty footer info (None) should be skipped gracefully.
+
+    _xml2dict returns {"info": None} for empty XML elements like <info/>
+    or <info></info>. This must not crash _truncate_corrupted_offsets.
+    """
+    temp = {
+        1: MockStreamData(time_stamps=np.linspace(0, 100, 100)),
+        2: MockStreamData(time_stamps=np.linspace(0, 50, 50)),
+    }
+    streams = {
+        1: {"footer": {"info": {"sample_count": ["100"]}}},
+        2: {"footer": {"info": None}},
+    }
+
+    # Should not raise AttributeError
+    result = _truncate_corrupted_offsets(temp, streams)
+
+    # Stream 2 should be unchanged
+    assert len(result[2].time_stamps) == 50