Hallo MyGrid team,

I came across some strange behaviour in the execution of one of my 
workflows. Maybe one of you can tell me whether this is by design or a bug.

In principle I have a web service which produces a list. This list I 
feed into a beanshell where I produce a list of the same length, but 
with all 'undesired' results removed, so it is a list of strings with 
'null' values mixed in which I feed into a next beanshell for further 
operations. The output of the second beanshell is a error trace 
complaining that 'No value produced fro output variable X' which is the 
output variable of the first beanshell and has nothing to do with the 
second.

Is it illegal in Taverna to produce lists with null values? Why is this 
error trace on the second beanshell? Usually I would exepect the first 
beanshell to come up in bright red if it failed.

(The work around is straight forward - I was just not expecting this to 
happen.)

Best regards,
Anja


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