Actually when moving nodes around if we cannot move to the right/left the target sibling node will be NULL so we only need to check for that. This makes all the tests pass again.
Actually when moving nodes around if we cannot move to the right/left the target sibling node will be NULL so we only need to check for that. This makes all the tests pass again.

sebdesign/baum,masterakado/baum,etrepat/baum,unikent/baum,atorscho/baum,retroconduct/baum