Fixes MATLAB hang when running symbolic code.

fixes #80

Author: rashedmyt

src/jupyter_matlab_kernel/matlab/+jupyter/execute.m

@@ -270,5 +270,7 @@
 result.value = [sprintf("%s",text), text];
 
 % Helper function to notify browser page load finished
-function pageLoadCallback(~,~,idler)
+function pageLoadCallback(webwindow,~,idler)
 idler.stopIdling();
+% Disable alert box which is preventing running JS after certain period of time.
+webwindow.executeJS('window.alert = function(){}');