[hbbtv] fix crash parsing xml.

[VuPlus Git]

[hbbtv] fix crash parsing xml.
fix keymap bug.

• [DH] lib/python/Plugins/Extensions/HbbTV/aitreader.py
• [DH] lib/python/Plugins/Extensions/HbbTV/browser.py
• [DH] lib/python/Plugins/Extensions/HbbTV/plugin.py

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