fix: undefined query should work like null query VSCODE-774

src/test/suite/views/data-browsing-app/documentQuerySlice.test.tsx

@@ -347,6 +347,11 @@ describe('documentQuerySlice', function () {
   });
 
   describe('isBasicQuery', function () {
+    it('returns true when query is undefined', function () {
+      const state = { ...initialState, query: undefined };
+      expect(isBasicQuery(state)).to.be.true;
+    });
+
     it('returns true when query is null', function () {
       const state = { ...initialState, query: null };
       expect(isBasicQuery(state)).to.be.true;

src/views/data-browsing-app/store/documentQuerySlice.ts

@@ -106,7 +106,7 @@ const DEFAULT_ITEMS_PER_PAGE = 10;
 export const isBasicQuery = (
   state: any,
 ): state is DocumentQueryState & { query: null } => {
-  return state.query === null;
+  return state.query === null || state.query === undefined;
 };
 
 const recalculatePaginationValues = (