129621: Add a not empty check

This check is present in the other event handlers above so adding it here as well.

(cherry picked from commit 0b28789e4f)

src/app/submission/sections/form/section-form-operations.service.ts

@@ -403,7 +403,7 @@ export class SectionFormOperationsService {
             );
           }
         }
-      } else if (!value.hasValue()) {
+      } else if (isNotEmpty(value) && !value.hasValue()) {
         // New value is empty, so dispatch a remove operation
         if (this.getArrayIndexFromEvent(event) === 0) {
           this.operationsBuilder.remove(pathCombiner.getPath(segmentedPath));