Test: fix test case

Adding dynamic property with an invalid name or existing name is now an
error, because there is no easy way for Python code to find out the name
of a property if it is auto renamed.

src/Mod/Path/PathTests/TestPathStock.py

@@ -45,7 +45,6 @@ class TestPathStock(PathTestBase):
         model = FreeCAD.ActiveDocument.addObject("App::DocumentObjectGroup", "Model")
         model.addObject(self.base)
         self.job.Model = model
-        self.job.addProperty('App::PropertyLink', 'Proxy')
         self.job.Proxy = FakeJobProxy()
 
     def tearDown(self):

src/Mod/Test/Document.py

@@ -1325,7 +1325,7 @@ class DocumentPropertyCases(unittest.TestCase):
     # testing the up and downstream stuff
     props=self.Obj.supportedProperties()
     for i in props:
-        self.Obj.addProperty(i,i)
+        self.Obj.addProperty(i,i.replace(':','_'))
     tempPath = tempfile.gettempdir()
     tempFile = tempPath + os.sep + "PropertyTests.FCStd"
     self.Doc.saveAs(tempFile)