Rescue BLAST_NOT_INSTALLED_OR_NOT_EXECUTABLE
Rescue BLAST_NOT_INSTALLED_OR_NOT_EXECUTABLE

In bin/sequenceserver allowed the error
BLAST_NOT_INSTALLED_OR_NOT_EXECUTABLE to be rescued. Edited the
message in the rescue block to explain that a recent system update
may have broken the user's NCBI BLAST+ installation.

Signed-off-by: Lawrence John Maynard <99c9491dbc214083d560f356b771e6dd533c3bfe@gmx.com>

elsiklab/sequenceserver,yeban/sequenceserver,elsiklab/sequenceserver,yeban/sequenceserver,yeban/sequenceserver,elsiklab/sequenceserver,yeban/sequenceserver