[Backport release-1.6] Fix: Failed to get detail policy for application (#5049)

* Fix: Failed to get detail policy for application

Signed-off-by: wuzhongjian <wuzhongjian_yewu@cmss.chinamobile.com>
(cherry picked from commit 50f63bf8bc)

* Fix: Failed to get detail policy for application

Signed-off-by: wuzhongjian <wuzhongjian_yewu@cmss.chinamobile.com>
(cherry picked from commit 8c70f067fc)

Co-authored-by: wuzhongjian <wuzhongjian_yewu@cmss.chinamobile.com>

pkg/apiserver/domain/service/util.go

@@ -52,6 +52,9 @@ func guaranteePolicyNotExist(c []string, policy string) ([]string, bool) {
 // extractPolicyListAndProperty can extract policy from  string-format properties, and return
 // map-format properties in order to further update operation.
 func extractPolicyListAndProperty(property string) ([]string, map[string]interface{}, error) {
+	if len(property) == 0 {
+		return nil, nil, nil
+	}
 	content := map[string]interface{}{}
 	err := json.Unmarshal([]byte(property), &content)
 	if err != nil {

pkg/apiserver/domain/service/util_test.go

@@ -208,6 +208,14 @@ func TestExtractPolicyListAndProperty(t *testing.T) {
 				noError    bool
 			}{noError: false},
 		},
+		{
+			input: ``,
+			res: struct {
+				policies   []string
+				properties map[string]interface{}
+				noError    bool
+			}{policies: nil, properties: nil, noError: true},
+		},
 	}
 	for _, testCase := range testCases {
 		policy, properties, err := extractPolicyListAndProperty(testCase.input)