- removed the raise statement in do_worker_task() function as this is fatal in conjunction with PyQt5

- added a try - except clause for the situations when for a font can't be determined the family and name
- moved font parsing to the Geometry Editor: it is done everytime the Text tool is invoked
- made sure that the HPGL postprocessor is not populated in the Excellon postprocessors in Preferences as it make no sense (HPGL is useful only for Geometries)

FlatCAMWorker.py

@@ -60,7 +60,7 @@ class Worker(QtCore.QObject):
                 task['fcn'](*task['params'])
             except Exception as e:
                 self.app.thread_exception.emit(e)
-                raise e
+                # raise e
             finally:
                 self.task_completed.emit(self.name)