fix frontend number query

diff --git a/lib/python/Components/Converter/FrontendInfo.py b/lib/python/Components/Converter/FrontendInfo.py
index 3558802..796ac33 100644 (file)
--- a/lib/python/Components/Converter/FrontendInfo.py
+++ b/lib/python/Components/Converter/FrontendInfo.py
@@ -92,7 +92,8 @@ class FrontendInfo(Converter, object):
                                return 2
                        return -1
                elif self.type == self.SLOT_NUMBER:
-                       return self.source.slot_number or -1
+                       num = self.source.slot_number
+                       return num is None and -1 or num
 
        range = 65536
        value = property(getValue)