Fix batch task running in case of zero count.

source/core/taskrunner.js

@@ -21,7 +21,10 @@ OV.TaskRunner = class
 
     RunBatch (count, batchCount, callbacks)
     {
-        const stepCount = parseInt ((count - 1) / batchCount, 10) + 1;
+        let stepCount = 0;
+        if (count > 0) {
+            stepCount = parseInt ((count - 1) / batchCount, 10) + 1;
+        }
         this.Run (stepCount, {
             runTask : function (index, ready) {
                 const firstIndex = index * batchCount;

test/tests/taskrunner_test.js

@@ -44,5 +44,20 @@ describe ('Task Runner', function () {
                 done ();
             }
         });
+    });
+
+    it ('Run task batched zero times', function (done) {
+        var tr = new OV.TaskRunner ();
+        var indices = [];
+        tr.RunBatch (0, 3, {
+            runTask : function (firstIndex, lastIndex, ready) {
+                indices.push ([firstIndex, lastIndex]);
+                ready ();
+            },
+            onReady : function () {
+                assert.deepStrictEqual (indices, []);
+                done ();
+            }
+        });
     });     
 });