Do not require CN or RD_CN to be defined for all samples for CNVs in …

…get_called_samples()

src/svtk/svtk/utils/utils.py

@@ -119,9 +119,7 @@ def get_called_samples(record, include_null=False):
         for sample, gt in record.samples.items():
             # Get CN, or RD_CN if it doesn't exist
             cn = gt.get('CN', gt.get('RD_CN', None))
-            if cn is None:
-                raise ValueError(f"Genotype for {sample} in CNV record {record.id} has neither CN nor RD_CN assigned")
-            elif cn != 2:
+            if cn is not None and cn != 2:
                 samples.append(sample)
 
     return sorted(samples)