how do you reset / recover filter graph from python extract error ?

[cyrush]

If the execute fails due to a python error in the extract script, it seems hard to clean up the filter graph.

[Error] Ascent::execute 
{
  "file": "/global/project/projectdirs/alpine/software/ascent/gnu/7.3.0/spack/var/spack/stage/ascent-develop-s3dhmko64soruskubazf5fbpn674dy6g/ascent/src/ascent/runtimes/ascent_main_runtime.cpp",
  "line": 640,
  "message": "Cannot add extract filter, extract named \"e1\" already exists"
}

I tried actions setups that look like:

define extract
execute
reset

and

reset
define extract
execute

Note: The simulation will continue to run just fine, the expected right behavior is to show the python error message each time, instead of an error about defining a dup extract for ever after the second exe.

[cyrush]

note: this might be fixed with #340

[cyrush]

check if this is still an issue