live: display filesystem and device path if image_create() fails

display filesystem and path to device.

src/live/ogOperations.py

@@ -482,7 +482,7 @@ class OgLiveOperations:
         except:
             self._restartBrowser(self._url)
             logging.exception('Exception when running "image create" subprocess')
-            raise ValueError('Error: Incorrect command value')
+            raise ValueError(f'Error: Cannot create image for {fstype} filesyste in device {padev}')
 
         try:
             st = os.stat(image_path)