Merge pull request #284 from cyberious/has_interface_fix

Increase resilience if lookup var comes back with nil object

Author: Morgan Haskel

lib/puppet/parser/functions/has_interface_with.rb

@@ -25,7 +25,7 @@ module Puppet::Parser::Functions
     interfaces = lookupvar('interfaces')
 
     # If we do not have any interfaces, then there are no requested attributes
-    return false if (interfaces == :undefined)
+    return false if (interfaces == :undefined || interfaces.nil?)
 
     interfaces = interfaces.split(',')