#989 Developper issue: query arguments having a null value are dismissed

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3339 a333f486-631f-4898-b8df-5754b55c2be0

core/metamodel.class.php

@@ -2167,6 +2167,10 @@ abstract class MetaModel
 				{
 					$aScalarArgs[$sArgName] = (string) $value;
 				}
+				elseif (is_null($value))
+				{
+					$aScalarArgs[$sArgName] = null;
+				}
 			}
 		}
 		// Add standard contextual arguments