Description:
When I try to unregister multiple applications using group actions, it throws NPE occasionally. I looked into the stack trace and found the code which was throwing the error.

if (streamDeploymentPropertiesMap.containsKey(appName)) {
	Map<String, String> appDeploymentProperties = streamDeploymentPropertiesMap.get(streamAppName);
	if (appDeploymentProperties.containsKey(SkipperStream.SKIPPER_SPEC_VERSION)) {
		String version = appDeploymentProperties.get(SkipperStream.SKIPPER_SPEC_VERSION);
		if (version != null && version.equals(appVersion)) {
			return streamDefinition.getName();
		}
	}
}

NullPointerException is being thrown by AppRegistryController at line 342

• line 342: if (appDeploymentProperties.containsKey(SkipperStream.SKIPPER_SPEC_VERSION))

I don't have deep understanding in this code but I think NullPointerException is being thrown because streamDeploymentPropertiesMap.containsKey(appName) is not checking appropriate key(appName). You can see that on the next line streamDeploymentPropertiesMap.get(streamAppName), streamDeploymentPropertiesMap is retrieving a value from different key(streamAppName). I wonder if this is a bug or something that should work properly.

Release versions:
The version is 2.10.0

Custom apps:
Not related to custom apps.

Steps to reproduce:
Use dataflow version 2.10.0.
Register multiple applications. Then unregister applications using group action.

Screenshots:

Additional context:
Add any other context about the problem here.