d.vect: size<1 makes points disappear when using size_column

[mlennert]

In NC dataset with grass_trunk:

d.vect hospitals size=1 icon=basic/circle
d.erase
d.vect hospitals size=0.5 icon=basic/circle

=> one can see a change in size

d.vect -r hospitals size=1 icon=basic/circle size_column=HLS_
d.vect -r hospitals size=0.5 icon=basic/circle size_column=HLS_

=> no circles are displayed when size < 1 (same result with or without the -r flag).

In 6.4.3 the combination of size<1 and size_column works perfectly.

[mlennert]

Fixed with r60438/r60439.