Merge pull request #44459 from stefanfreitag/b-aws_instance-capacity-reservation

fix: fix interface conversion panic

Author: ewbankkit

.changelog/44459.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_instance: Fix `interface conversion: interface {} is nil, not map[string]interface {}` panics when `capacity_reservation_target` is empty
+```

internal/service/ec2/ec2_instance.go

@@ -3616,7 +3616,7 @@ func expandCapacityReservationSpecification(tfMap map[string]any) *awstypes.Capa
 		apiObject.CapacityReservationPreference = awstypes.CapacityReservationPreference(v)
 	}
 
-	if v, ok := tfMap["capacity_reservation_target"].([]any); ok && len(v) > 0 {
+	if v, ok := tfMap["capacity_reservation_target"].([]any); ok && len(v) > 0 && v[0] != nil {
 		apiObject.CapacityReservationTarget = expandCapacityReservationTarget(v[0].(map[string]any))
 	}
 

internal/service/ec2/ec2_instance_test.go

@@ -10048,7 +10048,7 @@ resource "aws_instance" "test" {
 resource "aws_ec2_capacity_reservation" "test" {
   instance_type     = data.aws_ec2_instance_type_offering.available.instance_type
   instance_platform = %[2]q
-  availability_zone = data.aws_availability_zones.available.names[0]
+  availability_zone = data.aws_availability_zones.available.names[1]
   instance_count    = 10
 
   tags = {