Pamhyr: Window: Fix title without study opened.

src/View/Tools/PamhyrWindow.py

@@ -186,6 +186,7 @@ class PamhyrWindow(ASubMainWindow, ListedSubWindow, PamhyrWindowTools):
     def _set_title(self):
         title = self._title
 
+        if self._study is not None:
             if self._study.is_read_only():
                 title = "⛔ " + title