#2 no zoomin for single click

[John Pulles]

When in zoom in mode, a single click will give the
error message "Alas, image loading failed". What
happens is that the area is too small, to zoom in to.

[John Pulles]

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user_id=731699

For a click, the zoom area had width and height '0', thus
the map request did not return anything. This is changed to
zooming in by a factor 2.