Setting empty string to language will throw an exception

[compulim]

When using playground, the language prop passed to Web Chat is empty string instead of undefined, which caused Web Chat throw an exception.

[cwhitten]

Today WebChat will blow up if language = "", it should not blow up/

[compulim]

@corinagum did we fixed this in #2226?

Look at App.js:148

[corinagum]

@compulim haha I thought you said that was a partial fix but I'm not sure what else needs to be done. One of us should test this on the Playground and report back