Going into infinite loop in error handle flow while iterate activity mapping error

[lixingwang]

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[] enhancement request
[] feature request
[] support request
[] general question

Current behavior (how does the issue manifest):
The error flow goes into dead loop while configuring an iterate over a log message activity with expected mapping error.
Expected behavior:
Return the error out rather than dead loop.
Minimal steps to reproduce the problem (not required if feature enhancement):
Attached reproducible flogo.json, start the engine and trigger rest get request.(http://localhost:8888/book)
flogo.json.zip

What is the motivation / use case for changing the behavior?

Please tell us about your environment (Operating system, docker version, browser & verison if webui, etc):

Flogo version (CLI & contrib/lib. If unknown, leave empty or state unknown): 0.X.X

Additional information you deem important (e.g. issue happens only occasionally):