Check for null mWebViewCore in selectText

 Bug 6306770

Change-Id: I83e70aef45ff6519e4e9eb70edae44efcecf6de8

Author: George Mount

core/java/android/webkit/WebViewClassic.java

@@ -4677,6 +4677,9 @@ public boolean selectText() {
      * Select the word at the indicated content coordinates.
      */
     boolean selectText(int x, int y) {
+        if (mWebViewCore == null) {
+            return false;
+        }
         mWebViewCore.sendMessage(EventHub.SELECT_WORD_AT, x, y);
         return true;
     }