fix(monitor): [124743455]unbinding no region object (#3408)

* fix unbinding no region object

* add changelog

---------

Co-authored-by: mikatong <mikatong@tencent.com>

Author: tongyiming

.changelog/3408.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_monitor_policy_binding_object: support unbinding objects without region
+```

tencentcloud/services/monitor/extension_monitor.go

@@ -92,6 +92,7 @@ var MonitorRegionMap = map[string]string{
 }
 
 var MonitorRegionMapName = map[string]string{
+	"-":      "ap-guangzhou",
 	"gz":     "ap-guangzhou",
 	"szjr":   "ap-shenzhen-fsi",
 	"gzopen": "ap-guangzhou-open",

tencentcloud/services/monitor/resource_tc_monitor_policy_binding_object_test.go

@@ -50,6 +50,22 @@ func TestAccTencentCloudMonitorPolicyBindingObjectResource_multiRegion(t *testin
 	})
 }
 
+func TestAccTencentCloudMonitorPolicyBindingObjectResource_noRegion(t *testing.T) {
+	t.Parallel()
+	resource.Test(t, resource.TestCase{
+		PreCheck:  func() { tcacctest.AccPreCheck(t) },
+		Providers: tcacctest.AccProviders,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccMonitorPolicyBindingNoRegionObject,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("tencentcloud_monitor_policy_binding_object.binding_multi_region_object", "dimensions.#", "1"),
+				),
+			},
+		},
+	})
+}
+
 const testAccMonitorPolicyBindingObjectBasic string = `
 resource "tencentcloud_monitor_policy_binding_object" "binding_object" {
   policy_id = "policy-dkfebnac"
@@ -84,3 +100,16 @@ resource "tencentcloud_monitor_policy_binding_object" "binding_multi_region_obje
   }
 }
 `
+
+const testAccMonitorPolicyBindingNoRegionObject string = `
+resource "tencentcloud_monitor_policy_binding_object" "binding_multi_region_object" {
+  policy_id = "policy-wt2kvmmq"
+  dimensions {
+    dimensions_json = jsonencode(
+      {
+        domain = "keep.tencentcloud-terraform-provider.cn"
+      }
+    )
+  }
+}
+`