Fix text decluttering when segment length is zero #12774
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Fixes #12752
When the segment length is zero there is a division by zero, which ultimately results in NaN values being inserted in the declutter tree. This causes all checks for overlapping labels to fail.
In the example in #12752 the second LineString of the first MultiLineString has the same start and end coordinates. At a low enough zoom level this gets simplified to just the start and end coordinates, thus resulting in a zero length LineString.