Alerting: Fix broken UI because of query being optional for some ExpressionQuer… (#69650)

* Fix broken UI because of query being optional for some ExpressionQuery coditions field

* Delete query field from conditions in utils.test.ts

public/app/features/alerting/unified/components/rule-editor/util.test.ts

@@ -396,16 +396,6 @@ function createThresholdExample(thresholdType: string): AlertQuery[] {
             params: [0, 10],
             type: thresholdType ?? 'gt',
           },
-          operator: {
-            type: 'and',
-          },
-          query: {
-            params: ['B'],
-          },
-          reducer: {
-            params: [],
-            type: 'last',
-          },
         },
       ],
       expression: 'B',

public/app/features/alerting/unified/components/rule-editor/util.ts

@@ -152,7 +152,7 @@ export function getThresholdsForQueries(queries: AlertQuery[]) {
       const threshold = condition.evaluator.params;
 
       // "classic_conditions" use `condition.query.params[]` and "threshold" uses `query.model.expression`
-      const refId = condition.query.params[0] ?? query.model.expression;
+      const refId = condition.query?.params[0] ?? query.model.expression;
 
       // if an expression hasn't been linked to a data query yet, it won't have a refId
       if (!refId) {