Fix segfault in bundle summary command (#1937)

## Changes
This PR introduces use of new `isNil` method. It allows to ensure we
filter out all improperly defined resources in `bundle summary` command.
This includes deleted resources or resources with incorrect
configuration such as only defining key of the resource and nothing
else.

Fixes #1919, #1913

## Tests
Added regression unit test case

Author: andrewnester

bundle/config/resources.go

@@ -41,6 +41,9 @@ type ConfigResource interface {
 
 	// InitializeURL initializes the URL field of the resource.
 	InitializeURL(baseURL url.URL)
+
+	// IsNil returns true if the resource is nil, for example, when it was removed from the bundle.
+	IsNil() bool
 }
 
 // ResourceGroup represents a group of resources of the same type.
@@ -57,6 +60,9 @@ func collectResourceMap[T ConfigResource](
 ) ResourceGroup {
 	resources := make(map[string]ConfigResource)
 	for key, resource := range input {
+		if resource.IsNil() {
+			continue
+		}
 		resources[key] = resource
 	}
 	return ResourceGroup{

bundle/config/resources/clusters.go

@@ -56,3 +56,7 @@ func (s *Cluster) GetName() string {
 func (s *Cluster) GetURL() string {
 	return s.URL
 }
+
+func (s *Cluster) IsNil() bool {
+	return s.ClusterSpec == nil
+}

bundle/config/resources/dashboard.go

@@ -79,3 +79,7 @@ func (r *Dashboard) GetName() string {
 func (r *Dashboard) GetURL() string {
 	return r.URL
 }
+
+func (r *Dashboard) IsNil() bool {
+	return r.Dashboard == nil
+}

bundle/config/resources/job.go

@@ -63,3 +63,7 @@ func (j *Job) GetName() string {
 func (j *Job) GetURL() string {
 	return j.URL
 }
+
+func (j *Job) IsNil() bool {
+	return j.JobSettings == nil
+}

bundle/config/resources/mlflow_experiment.go

@@ -58,3 +58,7 @@ func (s *MlflowExperiment) GetName() string {
 func (s *MlflowExperiment) GetURL() string {
 	return s.URL
 }
+
+func (s *MlflowExperiment) IsNil() bool {
+	return s.Experiment == nil
+}

bundle/config/resources/mlflow_model.go

@@ -58,3 +58,7 @@ func (s *MlflowModel) GetName() string {
 func (s *MlflowModel) GetURL() string {
 	return s.URL
 }
+
+func (s *MlflowModel) IsNil() bool {
+	return s.Model == nil
+}

bundle/config/resources/model_serving_endpoint.go

@@ -66,3 +66,7 @@ func (s *ModelServingEndpoint) GetName() string {
 func (s *ModelServingEndpoint) GetURL() string {
 	return s.URL
 }
+
+func (s *ModelServingEndpoint) IsNil() bool {
+	return s.CreateServingEndpoint == nil
+}

bundle/config/resources/pipeline.go

@@ -58,3 +58,7 @@ func (p *Pipeline) GetName() string {
 func (s *Pipeline) GetURL() string {
 	return s.URL
 }
+
+func (s *Pipeline) IsNil() bool {
+	return s.PipelineSpec == nil
+}

bundle/config/resources/quality_monitor.go

@@ -62,3 +62,7 @@ func (s *QualityMonitor) GetName() string {
 func (s *QualityMonitor) GetURL() string {
 	return s.URL
 }
+
+func (s *QualityMonitor) IsNil() bool {
+	return s.CreateMonitor == nil
+}

bundle/config/resources/registered_model.go

@@ -68,3 +68,7 @@ func (s *RegisteredModel) GetName() string {
 func (s *RegisteredModel) GetURL() string {
 	return s.URL
 }
+
+func (s *RegisteredModel) IsNil() bool {
+	return s.CreateRegisteredModelRequest == nil
+}