new test tab opens without test specification loaded

Tst/codeblockreusefeature/codeblockreusefeature.cfg

@@ -25,6 +25,6 @@ threadname = True
 main-window-height = 791
 main-window-width = 612
 paned-position-search = 406
-paned-position-command-code = 105
+paned-position-command-code = 68
 paned-position-comment = 462
 

Tst/tst/data_model.py

@@ -989,6 +989,10 @@ class TestSpecification:
 
     @precon_name.setter
     def precon_name(self, value: str):
+        if value == None:
+            value = "None"
+        else:
+            pass
         assert isinstance(value, str)
         self._precon_name = value
 
@@ -1016,6 +1020,10 @@ class TestSpecification:
 
     @postcon_name.setter
     def postcon_name(self, value: str):
+        if value == None:
+            value = "None"
+        else:
+            pass
         assert isinstance(value, str)
         self._postcon_name = value
 

Tst/tst/tst.cfg

@@ -14,8 +14,8 @@ output-file-path = ${paths:tst}/logs_test_runs/output_files/
 
 [tst-preferences]
 show-json-view = True
-main-window-height = 1043
-main-window-width = 1920
+main-window-height = 752
+main-window-width = 1386
 paned-position = 919
 paned-position-codeblockreuse = 520
 

Tst/tst/tst.py

@@ -196,7 +196,7 @@ class TstAppWindow(Gtk.ApplicationWindow):
     def __init__(self, logger=logger, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.logger = logger
-        self.logger.info('Initializing a instance of the class TstAppWindow')
+        self.logger.info('Initializing an instance of the class TstAppWindow')
         self.product_paths = []
 
         # actions

Tst/tst/view.py

@@ -71,7 +71,7 @@ class Board(Gtk.Box):
     """
     def __init__(self, model, app, filename=None, logger=logger):
         """
-        When a instance is initialized:
+        When an instance is initialized:
         * a data model instance is created
         * the toolbar is created
         * a instance of a grid is added