fix(src/withGoogleMap): crash when google is not defined

[ToLi91]

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[ToLi91]

This will fix so a whole site does not crash when the google-maps script is not loaded, making window.google undefined.

Fix for Issues: #745 and #797

[Piemontez]

The withGoogleMap function doesn't prevent "google is not loaded" error.

I proposed a solution to this in
https://github.com/Piemontez/react-google-maps/blob/patch-1/src/withGoogleMap.jsx : 59.

In my case, my system operates offline too and this crash is right.

[ToLi91]

That will only work if the variable google has been defined to a falsely state. I have the problem where google is not yet defined due to that I did not allow the google maps js to load (NoScript).

I think both of these solutions are very good improvements which solves two different problems.

[mauriciosfriso]

It seems to be the same problem that #811. There it was solved

[ToLi91]

@mauriciosfriso yes this is very true!