clean up EventTile:onWidgetLoad optional/required mess

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/rooms/EventTile.js

@@ -154,6 +154,11 @@ module.exports = withMatrixClient(React.createClass({
         isTwelveHour: PropTypes.bool,
     },
 
+    defaultProps: {
+        // no-op function because onWidgetLoad is optional yet some subcomponents assume its existence
+        onWidgetLoad: function() {},
+    },
+
     getInitialState: function() {
         return {
             // Whether the context menu is being displayed.

src/components/views/rooms/ReplyPreview.js

@@ -75,11 +75,8 @@ export default class ReplyPreview extends React.Component {
                 <EventTile last={true}
                            tileShape="reply_preview"
                            mxEvent={this.state.event}
-                           onWidgetLoad={dummyOnWidgetLoad}
                            isTwelveHour={SettingsStore.getValue("showTwelveHourTimestamps")} />
             </div>
         </div>;
     }
 }
-
-function dummyOnWidgetLoad() {}