Using --extract-cves with --iava when some invalid IAVAs were returned fails spectacularly

[ryran]

$ rhsecapi --iava 2016-A-0332 -i 2016-A-9999 -x
[NOTICE ] rhsda: Valid Red Hat IAVA results retrieved: 0 of 2
[NOTICE ] rhsecapi: 76 duplicate CVEs removed
[NOTICE ] rhsda: Valid Red Hat CVE results retrieved: 0 of 26



  Not present in Red Hat CVE database

 
  Not present in Red Hat CVE database

-
  Not present in Red Hat CVE database

1
  Not present in Red Hat CVE database

0
  Not present in Red Hat CVE database

3
  Not present in Red Hat CVE database

2
  Not present in Red Hat CVE database

6
  Not present in Red Hat CVE database

9
  Not present in Red Hat CVE database

A
  Not present in Red Hat CVE database

I
  Not present in Red Hat CVE database

H
  Not present in Red Hat CVE database

N
  Not present in Red Hat CVE database

R
  Not present in Red Hat CVE database

V
  Not present in Red Hat CVE database

a
  Not present in Red Hat CVE database

b
  Not present in Red Hat CVE database

e
  Not present in Red Hat CVE database

d
  Not present in Red Hat CVE database

i
  Not present in Red Hat CVE database

o
  Not present in Red Hat CVE database

n
  Not present in Red Hat CVE database

p
  Not present in Red Hat CVE database

s
  Not present in Red Hat CVE database

r
  Not present in Red Hat CVE database

t
  Not present in Red Hat CVE database

[ryran]

Fixed by #61.