Catch general Exception in the UI when trying to connect or start a share, and raise as Alert

desktop/onionshare/resources/locale/en.json

@@ -247,6 +247,7 @@
     "error_port_not_available": "OnionShare port not available",
     "history_receive_read_message_button": "Read Message",
     "error_tor_protocol_error": "There was an error with Tor: {}",
+    "error_generic": "There was an unexpected error with OnionShare:\n{}",
     "moat_contact_label": "Contacting BridgeDB…",
     "moat_captcha_label": "Solve the CAPTCHA to request a bridge.",
     "moat_captcha_placeholder": "Enter the characters from the image",

desktop/onionshare/threads.py

@@ -106,6 +106,11 @@ class OnionThread(QtCore.QThread):
             message = self.mode.common.gui.get_translated_tor_error(e)
             self.error.emit(message)
             return
+        except Exception as e:
+            # Handle any other error that wasn't in the list above
+            message = strings._("error_generic").format(e.args[0])
+            self.error.emit(message)
+            return
 
 
 class WebThread(QtCore.QThread):

desktop/onionshare/tor_connection.py

@@ -210,6 +210,12 @@ class TorConnectionThread(QtCore.QThread):
             )
             self.error_connecting_to_tor.emit(message)
 
+        except Exception as e:
+            # Handle any other error that wasn't in the list above
+            message = strings._("error_generic").format(e.args[0])
+            self.error_connecting_to_tor.emit(message)
+            return
+
     def _tor_status_update(self, progress, summary):
         self.tor_status_update.emit(progress, summary)