Fix setting of executable for PluginABCE

[paulromano]

Description

The PluginABCE class was relying on the normal executable property from PluginGeneric, which assumes the file is actually a true executable. For ABCE, it is a Python script and so we need to modify the check for the executable as is done for PyARC.

@JiaZhou-PU can you check if this resolves your issue?

Checklist:

• My code follows the style guidelines
• I have performed a self-review of my own code
• I have updated the CHANGELOG.md file (if applicable)

[JiaZhou-PU]

@paulromano The plugin works!
I do have some other errors

Traceback (most recent call last):
  File "/Users/l00317783/Library/CloudStorage/Box-Box/abce/run.py", line 231, in <module>
    run_model()
  File "/Users/l00317783/Library/CloudStorage/Box-Box/abce/run.py", line 163, in run_model
    initialize_logging(args, settings["constants"]["vis_lvl"])
KeyError: 'constants'

I think this is caused by recent change of ABCE, not WATTS.

[paulromano]

Yes, that does indeed look like a problem with ABCE, not WATTS.

[nstauff]

@JiaZhou-PU - could you please try it?

[JiaZhou-PU]

@JiaZhou-PU - could you please try it?

I tried it, the plug-in works fine now.

[nstauff]

Thanks for the fix @paulromano