Add empty string constant

Author: kmcginnes

packages/graph-explorer/src/connector/entities/scalar.test.ts

@@ -158,6 +158,11 @@ describe("scalar", () => {
       expect(result).toBe("hello world");
     });
 
+    it("should return EMPTY_VALUE for empty string scalar", () => {
+      const result = getDisplayValueForScalar("   ");
+      expect(result).toBe(LABELS.EMPTY_VALUE);
+    });
+
     it("should return number for integer scalar", () => {
       const result = getDisplayValueForScalar(123456);
       expect(result).toBe("123,456");

packages/graph-explorer/src/connector/entities/scalar.ts

@@ -93,7 +93,8 @@ export function getDisplayValueForScalar(value: ScalarValue) {
   const typedValue = createTypedValue(value);
   switch (typedValue.type) {
     case "string":
-      return typedValue.value;
+      // Check for empty string
+      return !typedValue.value.trim() ? LABELS.EMPTY_VALUE : typedValue.value;
     case "number":
       return new Intl.NumberFormat().format(typedValue.value);
     case "boolean":

packages/graph-explorer/src/utils/constants.ts

@@ -38,4 +38,6 @@ export const LABELS = {
   MISSING_TYPE: `${ASCII.LAQUO}No Type${ASCII.RAQUO}`,
   /** Shown when a value is missing */
   MISSING_VALUE: `${ASCII.LAQUO}No Value${ASCII.RAQUO}`,
+  /** Shown when a value is empty (like empty string) */
+  EMPTY_VALUE: `${ASCII.LAQUO}Empty Value${ASCII.RAQUO}`,
 } as const;