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.
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<!-- generated by wxGlade 0.8.3 on Mon Aug 13 17:04:28 2018 -->
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<title>frame_1</title>
<style>wxDEFAULT_FRAME_STYLE|wxMAXIMIZE</style>
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<argument>$parent</argument>
<argument>$id</argument>
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<object class="sizeritem">
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<object class="sizeritem">
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<flag>wxEXPAND</flag>
<object class="wxBoxSizer" name="sizer_2" base="EditBoxSizer">
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<object class="sizerslot" />
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<object class="sizerslot" />
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<object class="sizeritem">
<option>1</option>
<border>0</border>
<flag>wxEXPAND</flag>
<object class="wxGridSizer" name="sizer_3" base="EditGridSizer">
<rows>6</rows>
<cols>2</cols>
<vgap>0</vgap>
<hgap>0</hgap>
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
<object class="sizerslot" />
</object>
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<object class="sizeritem">
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<border>0</border>
<object class="wxToggleButton" name="DrawTestBt" base="EditToggleButton">
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<object class="wxToggleButton" name="DrawTestBt2" base="EditToggleButton">
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<handler event="EVT_TOGGLEBUTTON">SetPLCTestBtn2GlobalVar</handler>
</events>
<label>Please Draw copy!</label>
</object>
</object>
</object>
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