Confusing message when a `process` based activity refers to a file/script that is not executable

[dmartin35]

see chaostoolkit/chaostoolkit#160

If you accidentally refer to a file that is not executable, the toolkit responds with the following message when doing a validate or run command:

[2020-01-30 16:00:27 ERROR] path 'None' cannot be found, in activity 'my-activity'

If possible it would be nice if the toolkit pointed out that you were referring to a file that was not executable so this could be debugged more easily.

[grexe]

I ran into this too and it took me some to figure out why a clearly correct path was detected as "None" and hence could not be found... cannot wait for this to be merged.

[dmartin35]

see PR #160

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