mirror fixes to SCBImortality

[teixeirak]

SCBI-ForestGEO/SCBImortality#32

[teixeirak]

SCBI-ForestGEO/SCBImortality#26

[teixeirak]

also, don't count info as missing when status is DN (#28)

[teixeirak]

@rudeboybert , it would be good to fix all this before they get more data.

[rudeboybert]

• fix status_A_but_unhealthy test SCBI-ForestGEO/SCBImortality#32
• improving error reports SCBI-ForestGEO/SCBImortality#26
• also, don't count info as missing when status is DN fixes to tests SCBI-ForestGEO/SCBImortality#28