waiting cursor is not released on some errors

[GGoetzelmann]

On mapping execution the cursor is set to a loading circle (

com_mapping-service-input/src/main.ts

Line 199 in a94effc

document.body.style.cursor = 'wait';

).
Since checks like proper selection of a file is checked afterwards and the cursor is only set back to its normal state on fetch success, the cursor is stuck in waiting state forever in case of an error

[ThomasJejkal]

Fixed