- 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)

FlatCAMGUI.py

@@ -11,6 +11,7 @@ from PyQt5.QtCore import Qt
 from GUIElements import *
 import platform
 
+
 class FlatCAMGUI(QtWidgets.QMainWindow):
     # Emitted when persistent window geometry needs to be retained
     geom_update = QtCore.pyqtSignal(int, int, int, int, int, name='geomUpdate')
@@ -1868,6 +1869,10 @@ class ExcellonPrefGroupUI(OptionsGroupUI):
         grid2.addWidget(excellon_gcode_type_label, 13, 0)
         grid2.addWidget(self.excellon_gcode_type_radio, 13, 1)
 
+        # until I decide to implement this feature those remain disabled
+        excellon_gcode_type_label.setDisabled(True)
+        self.excellon_gcode_type_radio.setDisabled(True)
+
         #### Milling Holes ####
         self.mill_hole_label = QtWidgets.QLabel('<b>Mill Holes</b>')
         self.mill_hole_label.setToolTip(