Bug: clusterClass prop missing on gmap-cluster component + can't disable img

[antoinematyja]

Describe the bug
Hello :) First of all thanks for this library 👍

I'm trying to use the cluster component like this:
https://googlemaps.github.io/v3-utility-library/packages/markerclustererplus/examples/advanced_example.html
The last cluster style : "Circles (css only)".

To reproduce this I need to set a few things like here :
https://github.com/googlemaps/v3-utility-library/blob/master/packages/markerclustererplus/examples/advanced_example.html#L235

The gmap-cluster component has a styles prop, but no clusterClass prop. It would be nice to add it.
https://googlemaps.github.io/v3-utility-library/interfaces/_google_markerclustererplus.markerclustereroptions.html#clusterclass

Even with this property, I didn't manage to achieve the same result as the example.
I set the styles prop to:

      [
        {
          width: 30,
          height: 30,
          className: 'custom-clustericon-1'
        },
        {
          width: 40,
          height: 40,
          className: 'custom-clustericon-2'
        },
        {
          width: 50,
          height: 50,
          className: 'custom-clustericon-3'
        }
      ]

(and add css styles)

But the gmap-cluster component stills render a <img src="undefined"> and won't apply the class. My guess is that a undefined url is provided and takes over the styles.

To Reproduce
Create a map with a gmap-cluster, try to set styles prop to this:

      [
        {
          width: 30,
          height: 30,
          className: 'custom-clustericon-1'
        },
        {
          width: 40,
          height: 40,
          className: 'custom-clustericon-2'
        },
        {
          width: 50,
          height: 50,
          className: 'custom-clustericon-3'
        }
      ]

Expected behavior
Cluster should be rendered with custom-clustericon-* classes

Current behavior
A <img src="undefined"> is rendered

Screenshots
Nope

Desktop (please complete the following information):

• OS: macOS Catalina
• Browser: Chrome
• Version: 84

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Nope

Versions

• Node: 12.8
• NPM: 6.14.4
• Yarn:

Package manager

• NPM
• Yarn

Plugin version

• 1.4.0
• 1.2.2
• 1.2.1
• 1.2.0
• 1.0.0

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[diegoazh]

@antoinematyja try the new version 2.0.0 and let me know if you find any issue there. Thanks and apologize for the bot and the delay.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[diegoazh]

@antoinematyja cluster is working properly on the new v2.0.3 please test it. Regards.