Added sanity checks to definition of mrIcons for Screensaver #1290
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Since some months ago there is a problem regarding the mrIcons[1,2] of the screenSaverEntities. Specifically i see crashes of the javascript-adapter of Iobroker, when values of an OpenDTU instance shall be displayed as mrIcon[1,2]ScreensaverEntity.ScreensaverEntityValue. It seems like the error handling is not good enough yet.
After applying the proposed changes, i see no crashes of the javascript-adapter anymore. Before, as an example, i saw this stack trace:
This relates to a broken path to one of the relays and a broken promise. Both are caught in this proposed change.