fix error when no size is provided at vnfd:vdus:volumes

Change-Id: I092245407d4acdb75b373e40905d9fc2e2b44b20
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/openmanod b/openmanod
index 5a1701d..367b505 100755
--- a/openmanod
+++ b/openmanod
@@ -48,8 +48,8 @@
 
 __author__ = "Alfonso Tierno, Gerardo Garcia, Pablo Montes"
 __date__ = "$26-aug-2014 11:09:29$"
-__version__ = "0.5.76-r586"
-version_date = "Ago 2018"
+__version__ = "0.5.77-r587"
+version_date = "Sep 2018"
 database_version = 32      # expected database schema version