fix(google-maps): rendering blank if custom options with no zoom are …

[dmitry-stepanenko]

Current Behavior

If an options object without a 'zoom' is passed to the Google Maps API, it'll render a grey rectangle which looks broken.

StackBlitz issue reproduction: https://stackblitz.com/edit/angular-ivy-w1znny?file=src%2Fapp%2Fapp.component.ts
Uncomment zoom option to let map render properly

Steps to reproduce:

1. setup google maps with options input

<google-map [options]="mapOptions"></google-map>

export class SomeComponent {
  ...
  options = {
    // zoom:15 // uncomment this line for map to render
  };
}

2. notice that the map won't be visible
3. add zoom property

export class SomeComponent {
  ...
  options = {
    zoom:15 // uncomment this line for map to render
  };
}

4. map is being loaded properly

Expected Behavior

Should fallback to default zoom level if not provided either in options or as a separate input

[crisbeto]

LGTM

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