add test case

tinyxml2.h

@@ -1458,7 +1458,7 @@ public:
 
 	XMLError QueryAttribute(const char* name, const char** value) const {
 		return QueryStringAttribute(name, value);
-		}
+	}
 
 	/// Sets the named attribute to value.
     void SetAttribute( const char* name, const char* value )	{

xmltest.cpp

@@ -632,6 +632,10 @@ int main( int argc, const char ** argv )
 		ele->SetAttribute( "int", 1 );
 		ele->SetAttribute( "double", -1.0 );
 
+		const char* answer = 0;
+		ele->QueryAttribute("str", &answer);
+		XMLTest("Query char attribute", "strValue", answer);
+
 		const char* cStr = ele->Attribute( "str" );
 		{
 			XMLError queryResult = ele->QueryIntAttribute( "int", &iVal );