Correct a test for polygons with too few points
Correct a test for polygons with too few points

Thanks to Jenny Duckett for pointing this error.  In fact, this
corrected version of the test is too brutal - we ignore the file
if any Polygon in the MultiPolygon has too few points.  In a
subsequent commit I will change this behaviour.

New-Bamboo/mapit,opencorato/mapit,opencorato/mapit,chris48s/mapit,chris48s/mapit,Sinar/mapit,New-Bamboo/mapit,chris48s/mapit,Sinar/mapit,opencorato/mapit,Code4SA/mapit,Code4SA/mapit,Code4SA/mapit