fixing emacs key handler when key code == -1 (this can happen with the

change introduced in #5e2c5f4)

lib/ace/keyboard/emacs.js

@@ -219,6 +219,10 @@ exports.handler.bindKey = function(key, command) {
 };
 
 exports.handler.handleKeyboard = function(data, hashId, key, keyCode) {
+    // if keyCode == -1 a non-printable key was pressed, such as just
+    // control. Handling those is currently not supported in this handler
+    if (keyCode === -1) return undefined;
+
     var editor = data.editor;
     // insertstring data.count times
     if (hashId == -1) {