Qhull error

[Chintak Sheth]

Stefan, I concur. Juan, 0.9 might have been a more plausible value, since
if I'm not mistaken it is "number of pixels in image / number of pixels in
the convex hull". Convex hull image will have more number of pixels. ;)
Couple of things:

   1. This error seems to pop up for this specific case. In the sense, if
   you remove the 1 in the 1st row, `regionprops` computes the 'Solidity'
   perfectly. No need of padding as well.
   2. The error comes up for all the three 'ConvexImage', 'ConvexArea' and
   'Solidity' even with the padded image. Whereas, `convex_hull_image`
   computes it alright. So, specifically for this padded case there seems to
   be a problem with the way the array is being passed and not Delaunay.

First, I think we need to find why the dual nature, `convex_hull_image`
independently works fine but not from `regionprops`. Next and a probable
way forward would be try/except, if an error occurs, then pad the image and
again try/except.

What do you'll think?

Chintak
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