Fix switch task will throw exception when there is not parameters (#15594)

dolphinscheduler-master/src/main/java/org/apache/dolphinscheduler/server/master/utils/SwitchTaskUtils.java

@@ -66,7 +66,7 @@ public class SwitchTaskUtils {
                                                        Map<String, Property> varParams) {
         String content = condition.replaceAll("'", "\"");
         if (MapUtils.isEmpty(globalParams) && MapUtils.isEmpty(varParams)) {
-            throw new IllegalArgumentException("globalParams and varParams are both empty, please check it.");
+            return content;
         }
         Map<String, Property> params = Maps.newHashMap();
         if (MapUtils.isNotEmpty(globalParams)) {

dolphinscheduler-master/src/test/java/org/apache/dolphinscheduler/server/master/utils/SwitchTaskUtilsTest.java

@@ -34,9 +34,8 @@ public class SwitchTaskUtilsTest {
         String content = "${test}==1";
         Map<String, Property> globalParams = new HashMap<>();
         Map<String, Property> varParams = new HashMap<>();
-        Assertions.assertThrowsExactly(IllegalArgumentException.class, () -> {
-            SwitchTaskUtils.generateContentWithTaskParams(content, globalParams, varParams);
-        });
+        Assertions.assertDoesNotThrow(
+                () -> SwitchTaskUtils.generateContentWithTaskParams(content, globalParams, varParams));
 
         globalParams.put("test", new Property("test", Direct.IN, DataType.INTEGER, "1"));
         String result = SwitchTaskUtils.generateContentWithTaskParams(content, globalParams, varParams);