Prevent division by 0 if total download size is 0

This can happen if the downloads are all so small that it gets rounded to 0kB.

Fixes Sentry issue CURA-ZM.

cura/PrinterOutput/Models/ExtruderOutputModel.py

@@ -99,7 +99,7 @@ class ExtruderOutputModel(QObject):
             self._is_preheating = pre_heating
             self.isPreheatingChanged.emit()
 
-    @pyqtProperty(bool, notify=isPreheatingChanged)
+    @pyqtProperty(bool, notify = isPreheatingChanged)
     def isPreheating(self) -> bool:
         return self._is_preheating
 

cura_app.py

@@ -39,7 +39,7 @@ except ImportError:
 parser = argparse.ArgumentParser(prog = "cura",
                                  add_help = False)
 parser.add_argument("--debug",
-                    action="store_true",
+                    action = "store_true",
                     default = False,
                     help = "Turn on the debug mode by setting this option."
                     )
@@ -49,7 +49,7 @@ known_args = vars(parser.parse_known_args()[0])
 if with_sentry_sdk:
     sentry_env = "unknown"  # Start off with a "IDK"
     if hasattr(sys, "frozen"):
-        sentry_env = "production"  # A frozen build has the posibility to be a "real" distribution.
+        sentry_env = "production"  # A frozen build has the possibility to be a "real" distribution.
 
     if ApplicationMetadata.CuraVersion == "master":
         sentry_env = "development"  # Master is always a development version.

plugins/Toolbox/src/CloudSync/DownloadPresenter.py

@@ -120,6 +120,10 @@ class DownloadPresenter:
             received += item["received"]
             total += item["total"]
 
+        if total == 0:  # Total download size is 0, or unknown, or there are no progress items at all.
+            self._progress_message.setProgress(100.0)
+            return
+
         self._progress_message.setProgress(100.0 * (received / total))  # [0 .. 100] %
 
     def _onError(self, package_id: str) -> None: