Errors with straightskeleton

[mhugo]

The garden test reports these errors, but only when compiled in debug mode:

3: error 1 in ( void )algorithm::straightSkeleton( *geom1 ) ;: CGAL ERROR: assertion violation!
3: Expr: is_finite(d)
3: File: /usr/local/include/CGAL/Interval_nt.h
3: Line: 122
3: error with valid geometry MULTIPOLYGON((()),(()))

3: error 2 in ( void )algorithm::straightSkeleton( *geom1 ) ;: CGAL ERROR: assertion violation!
3: Expr: is_finite(d)
3: File: /usr/local/include/CGAL/Interval_nt.h
3: Line: 122
3: error with valid geometry MULTIPOLYGON(((-3/1 -1/1,-1/1 -1/1,-1/1 1/1,-3/1 1/1,-3/1 -1/1)),(()))

3: error 3 in ( void )algorithm::straightSkeleton( *geom1 ) ;: CGAL ERROR: assertion violation!
3: Expr: is_finite(d)
3: File: /usr/local/include/CGAL/Interval_nt.h
3: Line: 122
3: error with valid geometry MULTIPOLYGON((()),(()))

I don't know yet if this is a false positive or a real issue, since it does not crash when compiled in release ...

[mhugo]

Fixed