Use provided na_rep string to represent null values

Author: sallybg

src/mavedb/lib/score_sets.py

@@ -567,19 +567,19 @@ def variant_to_csv_row(
         elif column_key == "accession":
             value = str(variant.urn)
         elif column_key == "post_mapped_hgvs_g":
-            value = str(mapping.hgvs_g) if mapping and mapping.hgvs_g else ""
+            value = str(mapping.hgvs_g) if mapping and mapping.hgvs_g else na_rep
         elif column_key == "post_mapped_hgvs_p":
-            value = str(mapping.hgvs_p) if mapping and mapping.hgvs_p else ""
+            value = str(mapping.hgvs_p) if mapping and mapping.hgvs_p else na_rep
         elif column_key == "post_mapped_hgvs_c":
-            value = str(mapping.hgvs_c) if mapping and mapping.hgvs_c else ""
+            value = str(mapping.hgvs_c) if mapping and mapping.hgvs_c else na_rep
         elif column_key == "post_mapped_hgvs_at_assay_level":
-            value = str(mapping.hgvs_assay_level) if mapping and mapping.hgvs_assay_level else ""
+            value = str(mapping.hgvs_assay_level) if mapping and mapping.hgvs_assay_level else na_rep
         elif column_key == "vep_functional_consequence":
             vep_functional_consequence = mapping.vep_functional_consequence if mapping else None
             if vep_functional_consequence is not None:
                 value = vep_functional_consequence
             else:
-                value = ""
+                value = na_rep
         else:
             parent = variant.data.get(dtype) if variant.data else None
             value = str(parent.get(column_key)) if parent else na_rep