v.to.rast: Always give warning when type is not present #2498
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When there are no areas in the vector map, v.to.rast gives warning, 'No areas selected'. This makes the behavior consistent for all types, so same warning is generated for points, lines, boundaries, and centroids.
The default for type is point, line, and area, so for a common vector map with a single type (point, line, or area), the default parameters now produce two warnings.