Handle null in utils

libs/common/spec/misc/utils.spec.ts

@@ -70,4 +70,10 @@ describe("Utils Service", () => {
       expect(Utils.newGuid()).toMatch(validGuid);
     });
   });
+
+  describe("fromByteStringToArray", () => {
+    it("should handle null", () => {
+      expect(Utils.fromByteStringToArray(null)).toEqual(null);
+    });
+  });
 });

libs/common/src/misc/utils.ts

@@ -97,6 +97,9 @@ export class Utils {
   }
 
   static fromByteStringToArray(str: string): Uint8Array {
+    if (str == null) {
+      return null;
+    }
     const arr = new Uint8Array(str.length);
     for (let i = 0; i < str.length; i++) {
       arr[i] = str.charCodeAt(i);