[Biopython] issues with NCBIXML

[Nat Echols]

Hi again,

I'm puzzled by the behavior of the Blast XML parser.  It appears to be
picking up all of the alignments correctly, but the
top-level Bio.Blast.Record.Blast object that it returns appears to be
incompletely populated.  Specifically, the attributes num_hits and
num_sequences are set to None - but I have several dozen alignments.  Am I
missing the point of these attributes, or doing something wrong?  It's not a
huge issue (I can just count the alignments, I guess), but I'm a bit
concerned that there's something wrong with my code.

thanks,
Nat