add error message if config.js appears empty after loading w require() in app.js #3383
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from forum, https://forum.magicmirror.builders/topic/18493/node_helper-js-is-not-working
user created own config.js, did not copy the module exports line..
this caused the js/defaults.js list of modules to be processed for node_helpers
but the physical config.js to be loaded for the web page (hard coded in index.html)
so user modules needing node_helper didn't have that ..
this adds a warning message in npm start output to help user resolve.. took two days to debug without message