test to catch validation err in phylesystem-1 issue#2
should not warn about @otu in internal node
checking that @otu value of nodes are valid in v1.2
ignoring test product
validation of @otu for v1.0 an v0.0
ignoring test output
another ignoring test output
check returns True rather than None to indicate passing
Merge pull request #55 from OpenTreeOfLife/phylesystem-1-issue-2

Phylesystem 1 issue 2