Don't put focus on the viewer if we couldn't find any documentation.

Task-number: QTCREATORBUG-2326

src/plugins/help/helpplugin.cpp

@@ -858,8 +858,8 @@ void HelpPlugin::activateContext()
                 viewer->page()->mainFrame()->scrollToAnchor(source.fragment());
 #endif
             }
+            viewer->setFocus();
         }
-        viewer->setFocus();
     }
 }