Improve default zoom when there are no coordinates

[JeroenDeDauw]

Import from https://bugzilla.wikimedia.org/show_bug.cgi?id=57337

You can see the issue here:

http://semantic-mediawiki.org/wiki/Yaron%27s_location

This page calls a template, which calls #display_point - the "coordinates" parameter is set to null, while the "zoom" parameter is set to 7. So, what shows up on the map is a highly-zoomed view of a location somewhere off the coast of Africa. Instead, if the coordinates (or address, etc.) are null, I would think #display_point should ignore the "zoom" parameter, and always set to it the lowest zoom level, i.e. show the whole world.

-- @yaronkoren 2013-11-21 01:35:46 UTC

[JeroenDeDauw]

Still relevant for Maps 3.5