fix(grid): add test for filtering without condition operator

Author: hanastasov

projects/igniteui-angular/src/lib/data-operations/filtering-strategy.spec.ts

@@ -49,6 +49,20 @@ describe('Unit testing FilteringStrategy', () => {
         const res = fs.matchRecord(rec, expressionTree);
         expect(res).toBeTruthy();
     });
+    it ('tests `matchRecordByExpressions` for working with filtering operands with missing condition', () => {
+        const rec = data[0];
+        const expressionTree = new FilteringExpressionsTree(FilteringLogic.Or);
+        expressionTree.filteringOperands = [
+            {
+                conditionName: 'contains',
+                fieldName: 'string',
+                ignoreCase: false,
+                searchVal: 'ROW'
+            }
+        ];
+        const res = fs.matchRecord(rec, expressionTree);
+        expect(res).toBeFalsy();
+    });
     it ('tests `findMatch`', () => {
         const rec = data[0];
         const res = fs.findMatchByExpression(rec, {