FEM: some Python constraint VP, add import of FemGui to get the icon in TreeView when there is no analysis and Fem is not loaded

src/Mod/Fem/femguiobjects/_ViewProviderFemSolverCalculix.py

@@ -31,7 +31,6 @@ import FreeCAD
 import FreeCADGui
 import FemGui
 
-
 # for the panel
 from femtools import ccxtools
 from PySide import QtCore