clear all status as images are also removed

jass/models/project.py

@@ -256,11 +256,7 @@ class Project(BaseModel, abc.ABC):
             os.remove(project_hdf_path)
         # as a consequence, its creation will have to be redone, so set progress to 0 and remove is status.
         self.progress = 0
-        try:
-            del self.status['worktable']
-        except KeyError:
-            # worktable not in status
-            pass
+        self.status.clear()
         self.save()
 
         if self.delayed_gen_csv_file: