Partial fix of ModelicaTest.Fluid.TestComponents.Pipes.DynamicPipesWithTraceSubstances in #1114 (fails on Linux with Dymola 2014 according to Michael Wetter)

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6578 7ce873d0-865f-4ce7-a662-4bb36ea78beb