ensure actions dont break the graph in modules with no instances

.changes/v1.14/BUG FIXES-20260123-103307.yaml

@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: actions in modules without instances failed the plan graph
+time: 2026-01-23T10:33:07.244665+01:00
+custom:
+    Issue: "38089"

internal/terraform/context_apply_action_test.go

@@ -783,6 +783,32 @@ resource "test_object" "a" {
 			}},
 		},
 
+		"not triggered with no module instances": {
+			module: map[string]string{
+				"main.tf": `
+module "mod" {
+    count = 0
+    source = "./mod"
+}
+
+// an empty plan is not applyable so we have this extra resource here
+resource "test_object" "a" {} 
+`,
+				"mod/mod.tf": `
+action "action_example" "hello" {}
+resource "test_object" "a" {
+  lifecycle {
+    action_trigger {
+      events = [before_create]
+      actions = [action.action_example.hello]
+    }
+  }
+}
+`,
+			},
+			expectInvokeActionCalled: false,
+		},
+
 		"provider is within module": {
 			module: map[string]string{
 				"main.tf": `

internal/terraform/context_plan_actions_test.go

@@ -1749,6 +1749,82 @@ resource "other_object" "a" {
 				},
 			},
 
+			"not triggered if module is count=0": {
+				module: map[string]string{
+					"main.tf": `
+module "mod" {
+    count = 0
+    source = "./mod"
+}
+`,
+					"mod/mod.tf": `
+action "test_action" "hello" {}
+resource "other_object" "a" {
+  lifecycle {
+    action_trigger {
+      events = [before_create]
+      actions = [action.test_action.hello]
+    }
+  }
+}
+`,
+				},
+				expectPlanActionCalled: false,
+			},
+
+			"not triggered if for_each is empty": {
+				module: map[string]string{
+					"main.tf": `
+module "mod" {
+    for_each = toset([])
+    source = "./mod"
+}
+`,
+					"mod/mod.tf": `
+action "test_action" "hello" {}
+resource "other_object" "a" {
+  lifecycle {
+    action_trigger {
+      events = [before_create]
+      actions = [action.test_action.hello]
+    }
+  }
+}
+`,
+				},
+				expectPlanActionCalled: false,
+			},
+
+			"action declaration in module if module is count=0": {
+				module: map[string]string{
+					"main.tf": `
+module "mod" {
+    count = 0
+    source = "./mod"
+}
+`,
+					"mod/mod.tf": `
+action "test_action" "hello" {}
+`,
+				},
+				expectPlanActionCalled: false,
+			},
+
+			"action declaration in module if for_each is empty": {
+				module: map[string]string{
+					"main.tf": `
+module "mod" {
+    for_each = toset([])
+    source = "./mod"
+}
+`,
+					"mod/mod.tf": `
+action "test_action" "hello" {}
+`,
+				},
+				expectPlanActionCalled: false,
+			},
+
 			"provider is within module": {
 				module: map[string]string{
 					"main.tf": `

internal/terraform/node_action.go

@@ -55,7 +55,6 @@ func (n *nodeExpandActionDeclaration) DynamicExpand(ctx EvalContext) (*Graph, tf
 				resolvedProvider: n.ResolvedProvider,
 			})
 		}
-		addRootNodeToGraph(&g)
 	}
 
 	for _, module := range moduleInstances {
@@ -94,9 +93,8 @@ func (n *nodeExpandActionDeclaration) DynamicExpand(ctx EvalContext) (*Graph, tf
 
 			g.Add(&node)
 		}
-
-		addRootNodeToGraph(&g)
 	}
+	addRootNodeToGraph(&g)
 
 	return &g, diags
 }