update tests ticket:3960

Author: adrpo

openmodelica/cppruntime/fmu/modelExchange/2.0/testModelDescription.mos

@@ -143,8 +143,6 @@ readFile("modelDescription.tmp.xml");
 //     <Outputs>
 //       <Unknown index=\"4\" dependencies=\"\" dependenciesKind=\"\" />
 //     </Outputs>
-//     <Derivatives>
-//     </Derivatives>
 //     <DiscreteStates>
 //       <Unknown index=\"3\" dependencies=\"\" dependenciesKind=\"\" />
 //     </DiscreteStates>

openmodelica/fmi/ModelExchange/2.0/testBug3049.mos

@@ -87,8 +87,6 @@ readFile("modelDescription.tmp.xml");
 //       <Unknown index=\"2\" dependencies=\"\" dependenciesKind=\"\" />
 //       <Unknown index=\"3\" dependencies=\"\" dependenciesKind=\"\" />
 //     </Outputs>
-//     <Derivatives>
-//     </Derivatives>
 //   </ModelStructure>
 // </fmiModelDescription>
 // "