[BUG] if / else's else node depends on multiple nodes, do you need to execute the else node?

[xingchun-chen]

As shown in the following figure: after the if / else node fails, the after_3 node will not be executed, but the after_3 node depends on the shell_2 node. After shell_2 is successfully executed, after_3 is also successfully executed, but after_4 is not executed.

The requirements are to be determined:
1. After the if / else node fails, does after_3 need to be executed again?
            2.After the execution of after_3 is successful, do you need to wait for after_2 and after_4 to execute successfully at the same time before executing merge_1?
如下图所示：if/else节点失败后，不会执行after_3节点，但是after_3节点依赖shell_2节点，shell_2执行成功后，after_3也执行成功，after_4却没有执行

需求待确定：1. if/else节点失败后，after_3是否需要再执行
2.after_3执行成功后，是否需要等after_2和after_4同时执行成功后，再执行merge_1

Which version of Dolphin Scheduler:
-[[1.2.0_release]]