Fixed VirtualEnvironmentExists

[Tom-Kingstone]

NOTE: Depends on

Issues addressed by this PR

Closes #127

Added a check for if the executable it is trying to run actually exists before running.

Test files

run LBT environment installer in grasshopper.

Changelog

Additional comments

[Tom-Kingstone]

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[FraserGreenroyd]

Based on discussion with @jamesramsden-bh and @Tom-Kingstone , this is not the right place to add the protection - it needs adding in the Version method as well.

[Tom-Kingstone]

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@Tom-Kingstone to confirm, the following actions are now queued:

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[FraserGreenroyd]

That looks robust now on code review @Tom-Kingstone , thanks!

[FraserGreenroyd]

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[FraserGreenroyd]

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[FraserGreenroyd]

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