project/lua_editor crash when websocket port in use

[WolfGangS]

Environment

Second Life Project Lua Editor 7.2.3.19450656087 (64bit)

Description

Viewer crashes when pressing the edit button on a script preview floater to edit externally, if the port is in use.
This primarily will affect users that run more than 1 copy of the viewer
But could also affect users that have that port in use by another process.

Suggest that when catching that port is in use, viewer pops up a notice saying something along the lines of.

Failed to open web socket port {port} already in use

Reproduction steps

1. Use Project lua editor viewer
2. Open instance of viewer
3. Make sure websocket features is enabled in preferences > advanced > script development
4. Make sure you have an external editor configured there too
5. Check option in preferences > advanced > allow multiple viewers
6. Open second instance
7. Login to sl on both
8. Create a prim, add a script, and open it on both
9. Press Edit... button to open externally on first viewer instance
10. Press Edit... button to open externally on second viewer instance

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