Path: Fix unable to import from CLI

Need to guard 'import FreeCADGui' in this case.

src/Mod/Path/PathScripts/PathProject.py

@@ -22,9 +22,13 @@
 #*                                                                         *
 #***************************************************************************
 
-import FreeCAD,FreeCADGui,Path,PathGui
+import FreeCAD,Path
 from PySide import QtCore,QtGui
 
+FreeCADGui = None
+if FreeCAD.GuiUp:
+    import FreeCADGui
+
 """Path Project object and FreeCAD command"""
 
 # Qt tanslation handling