compare ptr using == (#191)

Issue #, if available:
Addresses #182 (comment)

Testing:
mode e2e test using sagemaker controller

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: surajkota

templates/pkg/resource/manager.go.tpl

@@ -263,7 +263,7 @@ func (rm *resourceManager) onError(
 	r *resource,
 	err error,
 ) (acktypes.AWSResource, error) {
-	if ackcompare.IsNil(r) {
+	if r == nil {
 		return nil, err
 	}
 	r1, updated := rm.updateConditions(r, false, err)
@@ -286,7 +286,7 @@ func (rm *resourceManager) onError(
 func (rm *resourceManager) onSuccess(
 	r *resource,
 ) (acktypes.AWSResource, error) {
-	if ackcompare.IsNil(r) {
+	if r == nil  {
 		return nil, nil
 	}
 	r1, updated := rm.updateConditions(r, true, nil)