fix unexpected end of JSON input during planning

github.com/kbst/terraform-provider-kustomize/kustomize.kustomizationResourceDiff: github.com/kbst/terraform-provider-kustomize/kustomize.(*kManifest).load: json error: unexpected end of JSON input

kustomize/resource_kustomization.go

@@ -184,10 +184,14 @@ func kustomizationResourceDiff(ctx context.Context, d *schema.ResourceDiff, m in
 
 	do, dm := d.GetChange("manifest")
 
+	if dm.(string) == "" {
+		return nil
+	}
+
 	kmm := newKManifest(mapper, client)
 	err := kmm.load([]byte(dm.(string)))
 	if err != nil {
-		return logError(err)
+		return logError(fmt.Errorf("failed to parse new manifest: %s [body=%#v]", err, do.(string)))
 	}
 	setLastAppliedConfig(kmm, gzipLastAppliedConfig)
 
@@ -239,7 +243,7 @@ func kustomizationResourceDiff(ctx context.Context, d *schema.ResourceDiff, m in
 	kmo := newKManifest(mapper, client)
 	err = kmo.load([]byte(do.(string)))
 	if err != nil {
-		return logError(err)
+		return logError(fmt.Errorf("failed to parse old manifest: %s [body=%#v]", err, do.(string)))
 	}
 	setLastAppliedConfig(kmo, gzipLastAppliedConfig)