Ensure that the branch Tip is not null and throw a more intuitive exception than `NulReferenceException` if it is.
Ensure that the branch Tip is not null and throw a more intuitive exception than `NulReferenceException` if it is.

TODO: Need to document how to fix this and add the URI for it to the exception.

gep13/GitVersion,dpurge/GitVersion,FireHost/GitVersion,dpurge/GitVersion,dazinator/GitVersion,dpurge/GitVersion,onovotny/GitVersion,ermshiperete/GitVersion,pascalberger/GitVersion,ermshiperete/GitVersion,onovotny/GitVersion,GitTools/GitVersion,dazinator/GitVersion,JakeGinnivan/GitVersion,ParticularLabs/GitVersion,pascalberger/GitVersion,Philo/GitVersion,Philo/GitVersion,FireHost/GitVersion,onovotny/GitVersion,DanielRose/GitVersion,GitTools/GitVersion,asbjornu/GitVersion,ermshiperete/GitVersion,DanielRose/GitVersion,gep13/GitVersion,ParticularLabs/GitVersion,asbjornu/GitVersion,JakeGinnivan/GitVersion,dpurge/GitVersion,ermshiperete/GitVersion,DanielRose/GitVersion,JakeGinnivan/GitVersion,pascalberger/GitVersion,JakeGinnivan/GitVersion