Fix/cleanup hwloc_bitmap_taskset_sscanf parsing...
Fix/cleanup hwloc_bitmap_taskset_sscanf parsing...

Fix/cleanup hwloc_bitmap_taskset_sscanf parsing of empty strings

Otherwise we would get a bitmap with 0 valid ulong (disallowed).

This commit was SVN r3037.

ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc