'Find the section ID referenced by the key or return \'\' indicating
no such section id.'

def find_section_id(self, tool_panel_section_id):

    if (not tool_panel_section_id):
        tool_panel_section_id = ''
    elif (tool_panel_section_id not in self._tool_panel):
        fixed_tool_panel_section_id = ('section_%s' % tool_panel_section_id)
        if (fixed_tool_panel_section_id in self._tool_panel):
            tool_panel_section_id = fixed_tool_panel_section_id
        else:
            tool_panel_section_id = ''
    return tool_panel_section_id
