SVGHMI: Fix browser side exception when some widget are not used, and are then discarded and not present in final SVG. In that case JS code was still making reference to discarded widget elements and was raising exception at init.
<?xml version="1.0"?>
<!-- generated by wxGlade 0.6.4 on Thu May 16 13:24:16 2013 -->
<application path="" name="" class="" option="0" language="python" top_window="wxglade_hmi" encoding="UTF-8" use_gettext="0" overwrite="0" use_new_namespace="1" for_version="2.8" is_template="0" indent_amount="4" indent_symbol="space" source_extension=".cpp" header_extension=".h">
<object class="Class_wxglade_hmi" name="wxglade_hmi" base="EditFrame">
<style>wxDEFAULT_FRAME_STYLE</style>
<title>frame_1</title>
<object class="wxStaticBoxSizer" name="sizer_1" base="EditStaticBoxSizer">
<orient>wxVERTICAL</orient>
<label>Wiimote Test</label>
<object class="sizeritem">
<flag>wxEXPAND</flag>
<border>0</border>
<option>0</option>
<object class="wxButton" name="button_1" base="EditButton">
<label>Connect Wiimote</label>
<events>
<handler event="EVT_BUTTON">OnConnectButton</handler>
</events>
</object>
</object>
<object class="sizeritem">
<flag>wxEXPAND</flag>
<border>0</border>
<option>0</option>
<object class="wxButton" name="button_2" base="EditButton">
<label>Disconnect Wiimote</label>
<events>
<handler event="EVT_BUTTON">OnDisconnectButton</handler>
</events>
</object>
</object>
<object class="sizeritem">
<flag>wxEXPAND</flag>
<border>0</border>
<option>0</option>
<object class="wxStaticText" name="label_1" base="EditStaticText">
<attribute>1</attribute>
<label>Status :</label>
</object>
</object>
<object class="sizeritem">
<flag>wxEXPAND</flag>
<border>0</border>
<option>0</option>
<object class="wxStaticText" name="label_2" base="EditStaticText">
<attribute>1</attribute>
<label>no status</label>
</object>
</object>
</object>
</object>
</application>