Single key column name simplification

test/points/default.yaml

@@ -1 +1,5 @@
-points.zones.matrix:
+points.zones:
+  matrix:
+  single_key_column:
+    columns:
+      named:

test/points/default___demo_dxf.dxf

@@ -93,6 +93,54 @@ LINE
 21
 9
 0
+LINE
+8
+0
+10
+-9
+20
+9
+11
+9
+21
+9
+0
+LINE
+8
+0
+10
+9
+20
+9
+11
+9
+21
+-9
+0
+LINE
+8
+0
+10
+9
+20
+-9
+11
+-9
+21
+-9
+0
+LINE
+8
+0
+10
+-9
+20
+-9
+11
+-9
+21
+9
+0
 ENDSEC
 0
 EOF

test/points/default___points.json

@@ -41,5 +41,51 @@
                 0
             ]
         }
+    },
+    "single_key_column_named": {
+        "x": 0,
+        "y": 0,
+        "r": 0,
+        "meta": {
+            "stagger": 0,
+            "spread": 0,
+            "splay": 0,
+            "origin": [
+                0,
+                0
+            ],
+            "orient": 0,
+            "shift": [
+                0,
+                0
+            ],
+            "rotate": 0,
+            "width": 18,
+            "height": 18,
+            "padding": 19,
+            "autobind": 10,
+            "skip": false,
+            "asym": "both",
+            "colrow": "named_default",
+            "name": "single_key_column_named",
+            "zone": {
+                "columns": {
+                    "named": null
+                },
+                "name": "single_key_column"
+            },
+            "col": {
+                "rows": {},
+                "key": {},
+                "name": "named"
+            },
+            "row": "default",
+            "bind": [
+                0,
+                0,
+                0,
+                0
+            ]
+        }
     }
 }