Fix compile error because of required new actions parameter

Change-Id: I180e7493d7647db9421b8cb750e3ebaee53f9a8e

polygerrit-ui/app/elements/plugins/gr-checks-api/gr-checks-api-types.ts

@@ -71,8 +71,8 @@ export interface FetchResponse {
    * Top-level actions that are not associated with a specific run or result.
    * Will be shown as buttons in the header of the Checks tab.
    */
-  actions: Action[];
-  runs: CheckRun[];
+  actions?: Action[];
+  runs?: CheckRun[];
 }
 
 export enum ResponseCode {

polygerrit-ui/app/services/checks/checks-service.ts

@@ -65,7 +65,6 @@ export class ChecksService {
               return of({
                 responseCode: ResponseCode.OK,
                 runs: [],
-                results: [],
               });
             }
             return from(
@@ -74,7 +73,7 @@ export class ChecksService {
           }
         ),
         tap(response => {
-          updateStateSetResults(pluginName, response.runs);
+          updateStateSetResults(pluginName, response.runs ?? []);
         })
       )
       .subscribe(() => {});