Skip None values in id generation.

diff --git a/fireinfo/system.py b/fireinfo/system.py
index 5dd4f0c137871ea89063f32981a9c74e473fe989..a0a3d24b318dba280b437530f1ed85547f0560b4 100644 (file)
--- a/fireinfo/system.py
+++ b/fireinfo/system.py
@@ -196,6 +196,9 @@ class System(object):
                # Sort out all bogous or invalid strings from the list.
                _ids = []
                for id in ids:
+                       if id is None:
+                               continue
+
                        for i in INVALID_ID_STRINGS:
                                if i in id:
                                        id = None