Added 'undefined' check on VERSION otherwise unbundled usage from npm fails #21
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The VERSION global variable gets injected by webpack for bundled versions of the client library. That is fine, however package.json "main" property is set to "src" which means usage through npm install references src/index.js which is unbundled. This fails with a ReferenceError to VERSION because index.js is unbundled.
I added a check for VERSION so this error can be avoided. If npm users need to find out the version of the client, they can do so via their app's package.json.