Fix nil pointer when task plugin load returns error (#5622)

flytepropeller/pkg/controller/nodes/task/handler.go

@@ -248,13 +248,14 @@ func (t *Handler) Setup(ctx context.Context, sCtx interfaces.SetupContext) error
 		logger.Infof(ctx, "Loading Plugin [%s] ENABLED", p.ID)
 		cp, err := pluginCore.LoadPlugin(ctx, sCtxFinal, p)
 
+		if err != nil {
+			return regErrors.Wrapf(err, "failed to load plugin - %s", p.ID)
+		}
+
 		if cp.GetID() == agent.ID {
 			t.agentService.CorePlugin = cp
 		}
 
-		if err != nil {
-			return regErrors.Wrapf(err, "failed to load plugin - %s", p.ID)
-		}
 		// For every default plugin for a task type specified in flytepropeller config we validate that the plugin's
 		// static definition includes that task type as something it is registered to handle.
 		for _, tt := range p.RegisteredTaskTypes {

flytepropeller/pkg/controller/nodes/task/handler_test.go

@@ -126,6 +126,8 @@ func Test_task_Setup(t *testing.T) {
 	k8sPluginDefault := &pluginK8sMocks.Plugin{}
 	k8sPluginDefault.OnGetProperties().Return(pluginK8s.PluginProperties{})
 
+	loadErrorPluginType := "loadError"
+
 	corePluginEntry := pluginCore.PluginEntry{
 		ID:                  corePluginType,
 		RegisteredTaskTypes: []pluginCore.TaskType{corePluginType},
@@ -154,6 +156,13 @@ func Test_task_Setup(t *testing.T) {
 		RegisteredTaskTypes: []pluginCore.TaskType{k8sPluginDefaultType},
 		ResourceToWatch:     &v1.Pod{},
 	}
+	loadErrorPluginEntry := pluginCore.PluginEntry{
+		ID:                  loadErrorPluginType,
+		RegisteredTaskTypes: []pluginCore.TaskType{loadErrorPluginType},
+		LoadPlugin: func(ctx context.Context, iCtx pluginCore.SetupContext) (pluginCore.Plugin, error) {
+			return nil, fmt.Errorf("test")
+		},
+	}
 
 	type wantFields struct {
 		pluginIDs       map[pluginCore.TaskType]string
@@ -232,6 +241,15 @@ func Test_task_Setup(t *testing.T) {
 				},
 			},
 			false},
+		{"load-error",
+			testPluginRegistry{
+				core: []pluginCore.PluginEntry{loadErrorPluginEntry},
+				k8s:  []pluginK8s.PluginEntry{},
+			},
+			[]string{loadErrorPluginType},
+			map[string]string{corePluginType: loadErrorPluginType},
+			wantFields{},
+			true},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {