Bugfix for loading xml

[TatianaBurek]

Loading the xml (attached) causes the model names in the database in the pull-down menu next to MODEL to be unclickable.
Also, the widget for selecting series values is not initialized correctly
plot_rhist_DPT2m_nostoch_stoch.xml.txt

There is a problem with loading series XML as well. The loading looks OK but the Series formatting rendering doesn't work properly.

plot_auc_DPT2m_ge288K_nostoch_stoch.xml.txt

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