[alert-script]alert msg should contains content

dolphinscheduler-alert-plugin/dolphinscheduler-alert-script/src/main/java/org/apache/dolphinscheduler/plugin/alert/script/ScriptSender.java

@@ -43,6 +43,7 @@ public class ScriptSender {
         userParams = config.get(ScriptParamsConstants.NAME_SCRIPT_USER_PARAMS);
     }
 
+    //fixme
     AlertResult sendScriptAlert(String msg) {
         AlertResult alertResult = new AlertResult();
         if (ScriptType.of(scriptType).equals(ScriptType.SHELL)) {

dolphinscheduler-alert-plugin/dolphinscheduler-alert-script/src/main/java/org/apache/dolphinscheduler/plugin/alert/script/StreamGobbler.java

@@ -55,6 +55,13 @@ public class StreamGobbler extends Thread {
             }
         } catch (IOException e) {
             logger.error("I/O error occurs {}", e.getMessage());
+        } finally {
+            try {
+                inputBufferReader.close();
+                inputStreamReader.close();
+            } catch (IOException e) {
+                logger.error("I/O error occurs {}", e.getMessage());
+            }
         }
     }