Backport PR #6651

---------

**Commit 1:**
[courier/segmentedRequest] mark the request "started" synchronously

* Original sha: 8a4992640b
* Authored by spalger <spalger@users.noreply.github.com> on 2016-03-24T21:35:00Z

**Commit 2:**
[courier/fetch] detect aborted requests more agressively

* Original sha: c12f18df27
* Authored by spalger <spalger@users.noreply.github.com> on 2016-03-24T21:35:46Z

**Commit 3:**
[courier/callClient] if there are no executable requests, do nothing

* Original sha: 8fef03b816
* Authored by spalger <spalger@users.noreply.github.com> on 2016-03-24T21:36:18Z

**Commit 4:**
[courier/tests] updated test

* Original sha: 985f9970f3
* Authored by spalger <spalger@users.noreply.github.com> on 2016-03-24T22:25:31Z

src/ui/public/courier/fetch/_call_client.js

@@ -16,6 +16,8 @@ define(function (require) {
       var executable = statuses.filter(isRequest);
       var execCount = executable.length;
 
+      if (!execCount) return Promise.resolve([]);
+
       // resolved by respond()
       var esPromise;
       var defer = Promise.defer();

src/ui/public/courier/fetch/_fetch_these.js

@@ -23,22 +23,26 @@ define(function (require) {
     }
 
     function fetchWithStrategy(strategy, requests) {
+      function replaceAbortedRequests() {
+        requests = requests.map(r => r.aborted ? ABORTED : r);
+      }
 
-      requests = requests.map(function (req) {
-        return req.aborted ? ABORTED : req;
-      });
-
+      replaceAbortedRequests();
       return startRequests(requests)
       .then(function () {
+        replaceAbortedRequests();
         return callClient(strategy, requests);
       })
       .then(function (responses) {
+        replaceAbortedRequests();
         return callResponseHandlers(requests, responses);
       })
       .then(function (responses) {
+        replaceAbortedRequests();
         return continueIncomplete(strategy, requests, responses, fetchWithStrategy);
       })
       .then(function (responses) {
+        replaceAbortedRequests();
         return responses.map(function (resp) {
           switch (resp) {
             case ABORTED:

src/ui/public/courier/fetch/request/__tests__/segmented.js

@@ -29,9 +29,7 @@ describe('ui/courier/fetch/request/segmented', () => {
       expect(returned.then).to.be.Function;
     });
 
-    it('does not call super.start() until promise is resolved', () => {
-      expect(searchReqStart.called).to.be(false);
-      $rootScope.$apply();
+    it('calls super.start() synchronously', () => {
       expect(searchReqStart.called).to.be(true);
     });
   });

src/ui/public/courier/fetch/request/segmented.js

@@ -39,6 +39,8 @@ define(function (require) {
     SegmentedReq.prototype.start = function () {
       var self = this;
 
+      SearchReq.prototype.start.call(this);
+
       this._complete = [];
       this._active = null;
       this._segments = [];
@@ -58,12 +60,12 @@ define(function (require) {
       // parameters via the handle
       if (_.isFunction(this._initFn)) this._initFn(this._handle);
       return this._createQueue().then(function (queue) {
+        if (self.stopped) return;
+
         self._all = queue.slice(0);
 
         // Send the initial fetch status
         self._reportStatus();
-
-        return SearchReq.prototype.start.call(self);
       });
     };