Update block_submit.js

Added a validation to verify that 'someVariable' value is not null  , so that the Block functionality works smoothly

Author: rashmi269

Client-Side Components/Catalog Client Script/Block Submit/block_submit.js

@@ -1,7 +1,13 @@
 //Block the user from submitting the form based on variable answer
 function onSubmit() {
-  var someVariable = g_form.getValue("someVariable");
-  if(someVariable == 'No'){
+  var VariableName = 'someVariable';
+  var VariableVal = g_form.getValue(VariableName);
+	    // Basic validation
+    if (!VariableVal) {
+        g_form.showFieldMsg(VariableName, 'Please answer this question before submitting.', 'error');
+        return false;
+    }
+  if(VariableVal == 'No'){
 	var gm = new GlideModal('glide_warn',false);
         gm.setTitle("Submit Blocked! You can only use this form for someReason.  Review someInstructions");
         gm.render();