[API's `getSourceData` method creates a deep copy of `sourceData` object](https://github.com/wikipathways/pathvisiojs/blob/master/src/js/pathvisiojs.js#L168), thus even if returned object is altered, internal representation of the object will remain the same.

I removed `&#xA'` in 4216a710d4ec9d8bd09d4f016f1b6c2130cbb46c