Remove default value for vcs_pageview_mode
#617
Merged
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Fix readthedocs/readthedocs.org#3994
This variable is used on the template and evaluated to give a default value.
According to http://jinja.pocoo.org/docs/2.10/templates/#default default only works if the variable is undefined, or passing true as the second argument to evaluate to false. Otherwise, the variable is
''
so, it's defined and it's displayed.