perf(ngOptions): prevent initial options repainting

Avoid double execution of `updateOptions()` method,
which causes a complete repainting of all `<option>` elements.

Fixes angular#15801
Closes angular#15812

Author: pbr1111

src/ng/directive/ngOptions.js

@@ -453,6 +453,8 @@ var ngOptionsDirective = ['$compile', '$document', '$parse', function($compile,
       if (!multiple) {
 
         selectCtrl.writeValue = function writeNgOptionsValue(value) {
+          if (!options) return;
+
           var selectedOption = selectElement[0].options[selectElement[0].selectedIndex];
           var option = options.getOptionFromViewValue(value);
 
@@ -506,6 +508,7 @@ var ngOptionsDirective = ['$compile', '$document', '$parse', function($compile,
         selectCtrl.writeValue = function writeNgOptionsMultiple(values) {
           // Only set `<option>.selected` if necessary, in order to prevent some browsers from
           // scrolling to `<option>` elements that are outside the `<select>` element's viewport.
+          if (!options) return;
 
           var selectedOptions = values && values.map(getAndUpdateSelectedOption) || [];
 
@@ -588,9 +591,7 @@ var ngOptionsDirective = ['$compile', '$document', '$parse', function($compile,
 
       }
 
-      // We need to do this here to ensure that the options object is defined
-      // when we first hit it in writeNgOptionsValue
-      updateOptions();
+      // updateOptions();
 
       // We will re-render the option elements if the option values or labels change
       scope.$watchCollection(ngOptions.getWatchables, updateOptions);