1 files changed, 10 insertions, 0 deletions
diff --git a/conf/__init__.py b/conf/__init__.py
index 83c5475f..7f6c1912 100644
--- a/conf/__init__.py
+++ b/conf/__init__.py
@@ -108,6 +108,13 @@ class Settings(object):
             raise AttributeError("%r object has no attribute %r" %
                                  (self.__class__, attr))
 
+    def hasValue(self, attr):
+        """Return true if key exists
+        """
+        if attr in self.__dict__:
+            return True
+        return False
+
     def __setattr__(self, name, value):
         """Set a value
         """
@@ -256,6 +263,9 @@ class Settings(object):
         Expand VM option with given key for given number of VMs
         """
         tmp_value = self.getValue(key)
+        # skip empty/not set value
+        if not tmp_value:
+            return
         if isinstance(tmp_value, str):
             scalar = True
             master_value = tmp_value