Fixed assignment with an empty node (new API) - a segfault that only showed up in debuggable

include/yaml-cpp/node/impl.h

@@ -100,7 +100,9 @@ namespace YAML
 	// assignment
 	inline bool Node::is(const Node& rhs) const
 	{
-		return m_pNode ? m_pNode->is(*rhs.m_pNode) : false;
+        if(!m_pNode || !rhs.m_pNode)
+            return false;
+		return m_pNode->is(*rhs.m_pNode);
 	}
 
 	template<typename T>

test/new-api/nodetests.cpp

@@ -279,6 +279,13 @@ namespace Test
 			YAML_ASSERT(!!node["foo"]);
 			return true;
 		}
+        
+        TEST Reassign()
+        {
+            YAML::Node node = YAML::Load("foo");
+            node = YAML::Node();
+            return true;
+        }
 	}
 	
 	void RunNodeTest(TEST (*test)(), const std::string& name, int& passed, int& total) {
@@ -324,6 +331,7 @@ namespace Test
 		RunNodeTest(&Node::TempMapVariableAlias, "temp map variable alias", passed, total);
 		RunNodeTest(&Node::Bool, "bool", passed, total);
 		RunNodeTest(&Node::AutoBoolConversion, "auto bool conversion", passed, total);
+		RunNodeTest(&Node::Reassign, "reassign", passed, total);
 
 		std::cout << "Node tests: " << passed << "/" << total << " passed\n";
 		return passed == total;