Catch environment errors when restoring back-ups

There could be an environment error when saving that file because of access rights or insufficient disk space. Catch that error and display an error message to the user. The log then contains more information on exactly why it failed, but the user just knows it fails.

Fixes Sentry issue CURA-21W.

plugins/CuraDrive/src/RestoreBackupJob.py

@@ -1,3 +1,6 @@
+# Copyright (c) 2021 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 import base64
 import hashlib
 import threading
@@ -56,14 +59,20 @@ class RestoreBackupJob(Job):
             return
 
         # We store the file in a temporary path fist to ensure integrity.
-        temporary_backup_file = NamedTemporaryFile(delete = False)
-        with open(temporary_backup_file.name, "wb") as write_backup:
-            app = CuraApplication.getInstance()
-            bytes_read = reply.read(self.DISK_WRITE_BUFFER_SIZE)
-            while bytes_read:
-                write_backup.write(bytes_read)
+        try:
+            temporary_backup_file = NamedTemporaryFile(delete = False)
+            with open(temporary_backup_file.name, "wb") as write_backup:
+                app = CuraApplication.getInstance()
                 bytes_read = reply.read(self.DISK_WRITE_BUFFER_SIZE)
-                app.processEvents()
+                while bytes_read:
+                    write_backup.write(bytes_read)
+                    bytes_read = reply.read(self.DISK_WRITE_BUFFER_SIZE)
+                    app.processEvents()
+        except EnvironmentError as e:
+            Logger.log("e", f"Unable to save backed up files due to computer limitations: {str(e)}")
+            self.restore_backup_error_message = self.DEFAULT_ERROR_MESSAGE
+            self._job_done.set()
+            return
 
         if not self._verifyMd5Hash(temporary_backup_file.name, self._backup.get("md5_hash", "")):
             # Don't restore the backup if the MD5 hashes do not match.