Fixing an assumption that 'subAltNames' are always passed to the API.

lemur/certificates/views.py

@@ -78,6 +78,8 @@ def get_domains_from_options(options):
     :return:
     """
     domains = [options['commonName']]
+    if options.get('extensions'):
+        if options['extensions'].get('subAltNames'):
             for k, v in options['extensions']['subAltNames']['names']:
                 if k == 'DNSName':
                     domains.append(v)