[PATCH] rtemstoolkit/mailer.py: Check for no --smtp-host arg being provided

[Joel Sherrill]

---
 rtemstoolkit/mailer.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rtemstoolkit/mailer.py b/rtemstoolkit/mailer.py
index 241ee1c..f8f813c 100644
--- a/rtemstoolkit/mailer.py
+++ b/rtemstoolkit/mailer.py
@@ -67,7 +67,9 @@ class mail:
 
     def _get_arg(self, arg):
         if self._args_are_macros():
-            value = self.opts.find_arg(arg)[1]
+            value = self.opts.find_arg(arg)
+            if value is not None:
+                value = self.opts.find_arg(arg)[1]
         else:
             if arg.startswith('--'):
                 arg = arg[2:]
-- 
1.8.3.1