We'll want to give a proper error message then. We have no mechanism right now to show a message on the screen particular to this error. Instead we'll let it fail (the user sees a message that writing fails) and put a message in the log why it failed.
Fixes Sentry error CURA-DK.
It was using a bit of programmer jargon there that was very hard to understand. Initially I was coming in here to remove the space at the end of the translated string but I'm now changing all of it to make it more clear to the user as well.
Done as a 5 minute fix.
Reproduction steps:
* In the Material Manager, click on 'Import material'.
* Change the file type in the file dialogue to 'All files'.
* Select any .def.json file, for example from Cura's own resources/definitions folder.
Previously this crashed the application. Now it shows the user an error message instead.
Fixes Sentry error CURA-D4.
This happens when the printer is changed, such as when changing the Machine Width in the machine settings dialogue. It updates these menus then and if not all extruders are defined it'll give the following errors:
2020-03-20 16:56:57,839 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///home/trin/Gedeeld/Projects/Cura/resources/qml/Menus/SettingsMenu.qml:51: TypeError: Cannot read property 'isEnabled' of undefined
2020-03-20 16:56:57,840 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///home/trin/Gedeeld/Projects/Cura/resources/qml/Menus/SettingsMenu.qml:44: TypeError: Cannot read property 'isEnabled' of undefined
2020-03-20 16:56:57,841 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///home/trin/Gedeeld/Projects/Cura/resources/qml/Menus/MaterialMenu.qml:26: TypeError: Cannot read property 'isEnabled' of undefined
2020-03-20 16:56:57,841 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///home/trin/Gedeeld/Projects/Cura/resources/qml/Menus/MaterialMenu.qml:28: TypeError: Cannot read property 'material' of undefined
Done during Turbo Testing and Tooling.
