Bugfix isolated nodes

[LuisFelipeNuness]

New plugin or plugin update?

• [ ] New Plugin
• [X] Update

What is the purpose of this plugin?

Generate Bridging Centrality of a Graph

How to test your plugin in Gephi?

1. Generate nbm file and import locally in Gephi
2. Run with different types of Graph

Checklist before submission

• [X] Did you merged with the master branch to get the latest updates?
• [X] Did you build and test the plugin successfully locally?
• [X] Did you include metadata (e.g. plugin author, license) in the pom.xml file
• [X] Did you make sure NOT to include any unecessary files in your PR?
• [ ] Did you write unit tests to test your plugin functionalities?