DevTools: make debugger's rawLocationToUILocation return nullable type

third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1141 matching lines @@
 Sources.SourcesPanel.DebuggerLocationRevealer = class {
   /**
    * @override
    * @param {!Object} rawLocation
    * @param {boolean=} omitFocus
    * @return {!Promise}
    */
   reveal(rawLocation, omitFocus) {
     if (!(rawLocation instanceof SDK.DebuggerModel.Location))
       return Promise.reject(new Error('Internal error: not a debugger location'));
-    Sources.SourcesPanel.instance().showUILocation(
-        Bindings.debuggerWorkspaceBinding.rawLocationToUILocation(rawLocation), omitFocus);
+    var uiLocation = Bindings.debuggerWorkspaceBinding.rawLocationToUILocation(rawLocation);
+    if (!uiLocation)
+      return Promise.resolve();
+    Sources.SourcesPanel.instance().showUILocation(uiLocation, omitFocus);
     return Promise.resolve();
   }
 };
 
 /**
  * @implements {Common.Revealer}
  * @unrestricted
  */
 Sources.SourcesPanel.UISourceCodeRevealer = class {
   /**
@@ skipping 127 matching lines @@
    */
   willHide() {
     UI.inspectorView.setDrawerMinimized(false);
     setImmediate(() => Sources.SourcesPanel.updateResizerAndSidebarButtons(Sources.SourcesPanel.instance()));
   }
 
   _showViewInWrapper() {
     this._view.show(this.element);
   }
 };