(core) Fix for tests failures

Summary:
- DocApi test for Allowed Origin was using a home server endpoint
- Fixing waitForServer, as gristApp can be unavailable for a moment when browser is refreshed
- Fixing MergedOrgs tests typing issue

Test Plan: Updated

Reviewers: cyprien, paulfitz

Reviewed By: cyprien, paulfitz

Subscribers: paulfitz

Differential Revision: https://phab.getgrist.com/D3648

test/nbrowser/gristUtils.ts

@@ -831,7 +831,7 @@ export async function waitAppFocus(yesNo: boolean = true): Promise<void> {
  */
 export async function waitForServer(optTimeout: number = 2000) {
   await driver.wait(() => driver.executeScript(
-    "return (!window.gristApp.comm || !window.gristApp.comm.hasActiveRequests())"
+    "return window.gristApp && (!window.gristApp.comm || !window.gristApp.comm.hasActiveRequests())"
     + " && window.gristApp.testNumPendingApiRequests() === 0",
     optTimeout,
     "Timed out waiting for server requests to complete"

test/server/lib/DocApi.ts

@@ -2794,7 +2794,7 @@ function testDocApi() {
   describe("Allowed Origin", () => {
     it('should allow only example.com',  async () => {
       async function checkOrigin(origin: string, status: number, error?: string) {
-        const resp = await axios.get(`${serverUrl}/api/docs/${docIds.Timesheets}/`,
+        const resp = await axios.get(`${serverUrl}/api/docs/${docIds.Timesheets}/tables/Table1/data`,
         {...chimpy, headers: {...chimpy.headers, "Origin": origin}}
         );
         error && assert.deepEqual(resp.data, {error});
@@ -2805,8 +2805,8 @@ function testDocApi() {
       await checkOrigin("https://bad.com/example.com/toto", 500, "Unrecognized origin");
       await checkOrigin("https://example.com/path", 200);
       await checkOrigin("https://good.example.com/toto", 200);
-    })
+    });
-  })
+  });
 
   // PLEASE ADD MORE TESTS HERE
 }