fix(select): fix error when removing node on route change

closes #2481

Author: rschmukler

src/components/select/select.js

@@ -871,7 +871,9 @@ function SelectProvider($$interimElementProvider) {
       return $mdUtil.transitionEndPromise(element, { timeout: 350 }).then(function() {
         element.removeClass('md-active');
         opts.backdrop && opts.backdrop.remove();
-        opts.parent[0].removeChild(element[0]); // use browser to avoid $destroy event
+        if (element[0].parentNode === opts.parent[0]) {
+          opts.parent[0].removeChild(element[0]); // use browser to avoid $destroy event
+        }
         if (opts.disableParentScroll) {
           opts.restoreScroll();
         }